diff --git a/web/e2e/copy-dialog.spec.ts b/web/e2e/copy-dialog.spec.ts
index bdde381b3..3707e7248 100644
--- a/web/e2e/copy-dialog.spec.ts
+++ b/web/e2e/copy-dialog.spec.ts
@@ -711,4 +711,55 @@ test.describe('cross-workspace copy dialog (PLAN-2373 / TASK-2355)', () => {
 		await expect(page.locator('.item-pane')).toBeVisible();
 		await expect(more).toBeFocused();
 	});
+
+	// BUG-3230 U1: the copy answers `warnings.source_content_state` when the body
+	// it carried was behind the source's live document (BUG-3032). The server
+	// half is pinned in Go; this leg pins that the PANE reads it, by rewriting
+	// the 201 to carry the field, since this tab's own pre-copy flush would
+	// otherwise clear the stale state it needs. On main the toast was a plain
+	// green "Copied to …", which is what this asserts against.
+	for (const move of [false, true]) {
+		test(`a ${move ? 'move' : 'copy'} whose source body was behind its live document says so`, async ({
+			page,
+			fixture,
+			request,
+		}, testInfo) => {
+			test.skip(testInfo.project.name !== 'desktop-chromium', 'viewport driven explicitly');
+			await page.setViewportSize(DESKTOP);
+			await browserLogin(page);
+			const dest = await seedDestination(request, fixture, move ? 'stale-move' : 'stale-copy', {
+				name: 'Notes',
+				slug: 'notes',
+				fields: [],
+			});
+			const { slug } = await seedDoc(fixture, request, `Copy dialog stale ${move ? 'move' : 'copy'}`);
+			await page.goto(itemUrl(fixture, slug));
+
+			await page.route(/\/copy(\?|$)/, async (route) => {
+				if (route.request().method() !== 'POST') return route.continue();
+				const resp = await route.fetch();
+				const body = await resp.json();
+				body.warnings.source_content_state = 'applied_pending_flush';
+				await route.fulfill({ response: resp, json: body });
+			});
+
+			await openCopyDialog(page);
+			const dialog = copyDialog(page);
+			await dialog.getByLabel('Workspace', { exact: true }).selectOption(dest.wsSlug);
+			const preflight = page.waitForResponse((r) => r.url().includes('/copy/preflight') && r.status() === 200);
+			await dialog.getByLabel('Collection', { exact: true }).selectOption(dest.collSlug);
+			await preflight;
+			if (move) await dialog.getByRole('radio', { name: /^Move — / }).check();
+			const confirm = dialog.getByRole('button', { name: move ? 'Move' : 'Copy', exact: true });
+			await expect(confirm).toBeEnabled();
+			const copyResp = page.waitForResponse((r) => /\/copy(\?|$)/.test(r.url()) && r.request().method() === 'POST');
+			await confirm.click();
+			expect((await copyResp).status()).toBe(201);
+
+			const toast = page.getByText(/may be missing them/).first();
+			await expect(toast).toBeVisible();
+			await expect(toast).toContainText(move ? 'Moved to' : 'Copied to');
+			await expect(toast).toContainText(move ? 'archived original may still hold them' : 'Copy it again once they are saved');
+		});
+	}
 });
diff --git a/web/src/lib/components/items/ItemDetail.svelte b/web/src/lib/components/items/ItemDetail.svelte
index ca27a8886..d36c0aae1 100644
--- a/web/src/lib/components/items/ItemDetail.svelte
+++ b/web/src/lib/components/items/ItemDetail.svelte
@@ -78,6 +78,7 @@
 	import EditCollectionModal from '$lib/components/collections/EditCollectionModal.svelte';
 	import ShareDialog from '$lib/components/ShareDialog.svelte';
 	import CopyItemDialog from '$lib/components/items/CopyItemDialog.svelte';
+	import { copyResultToast } from '$lib/items/copyResultToast';
 	import PushToAgentDialog from '$lib/components/items/PushToAgentDialog.svelte';
 	import ItemAttachmentStrip from '$lib/components/items/ItemAttachmentStrip.svelte';
 	import DecisionChips from '$lib/components/items/DecisionChips.svelte';
@@ -5407,22 +5408,11 @@
 	 * archived + provenance banners render now rather than on the next load.
 	 */
 	async function handleCopied(result: ItemCopyResult) {
-		const dest = result.destination;
-		const label = dest.ref ?? dest.slug;
-		const verb = result.source.archived ? 'Moved' : 'Copied';
-		// A value dropped as NOT UNIQUE is named, not folded into a clean
-		// success (BUG-2367): the preview listed it, and the copy's own answer
-		// must say it too.
-		const notUnique = result.warnings.not_unique ?? [];
-		if (notUnique.length > 0) {
-			toastStore.show(
-				`${verb} to ${dest.workspace_name} as ${label}, without: ${notUnique.map((d) => d.message).join('; ')}`,
-				'info',
-				10000,
-			);
-		} else {
-			toastStore.show(`${verb} to ${dest.workspace_name} as ${label}`, 'success');
-		}
+		// A value dropped as NOT UNIQUE (BUG-2367) and a source body behind its
+		// live document (BUG-3230 U1) are named, not folded into a clean success.
+		const done = copyResultToast(result);
+		if (done.duration === undefined) toastStore.show(done.message, done.type);
+		else toastStore.show(done.message, done.type, done.duration);
 		if (!result.source.archived) return;
 		const targetItem = item;
 		if (!targetItem) return;
diff --git a/web/src/lib/components/items/itemDetailIdentityFenceAst.test.ts b/web/src/lib/components/items/itemDetailIdentityFenceAst.test.ts
index 0e747145b..924f7c0cf 100644
--- a/web/src/lib/components/items/itemDetailIdentityFenceAst.test.ts
+++ b/web/src/lib/components/items/itemDetailIdentityFenceAst.test.ts
@@ -157,7 +157,8 @@ const ASYNC_FUNCTIONS: Record<string, Row> = {
 	closeCopyDialog: { reviewed: '1c925f081a26', why: 'restores focus after closing synchronously', may: ['paneMenuTrigger.focus'] },
 	closePushDialog: { reviewed: 'bda8c7529677', why: 'restores focus after closing synchronously', may: ['paneMenuTrigger.focus'] },
 	flushContentBeforeCopy: { reviewed: 'd7083bf9954c', why: 'returns a boolean to the dialog' },
-	handleCopied: { reviewed: 'f35fb099838d', why: 'switchedAway before adopting the refreshed item' },
+	// BUG-3230 U1: the toast moved into copyResultToast, a pure function of the result; still before the await.
+	handleCopied: { reviewed: 'eecddaafa59b', why: 'switchedAway before adopting the refreshed item' },
 	handleDelete: { reviewed: 'b66adcf84794', why: 'switchedAway on both arms' },
 	handleRestore: { reviewed: 'c3a1732554a4', why: 'switchedAway on every arm' },
 	handleDeleteLink: { reviewed: 'd147285bb264', why: 'switchedAway after each await' },
diff --git a/web/src/lib/items/copyResultToast.test.ts b/web/src/lib/items/copyResultToast.test.ts
new file mode 100644
index 000000000..015dd8da3
--- /dev/null
+++ b/web/src/lib/items/copyResultToast.test.ts
@@ -0,0 +1,57 @@
+import { describe, it, expect } from 'vitest';
+import { copyResultToast } from './copyResultToast';
+import type { ItemCopyResult } from '$lib/types';
+
+function result(over: { archived?: boolean; stale?: boolean; notUnique?: string[] } = {}): ItemCopyResult {
+	return {
+		source: { archived: !!over.archived },
+		destination: { workspace_name: 'Other', ref: 'TASK-9', slug: 'x' },
+		archive_source: !!over.archived,
+		warnings: {
+			dropped_fields: [],
+			...(over.notUnique ? { not_unique: over.notUnique.map((m) => ({ key: 'k', value: 'v', message: m })) } : {}),
+			dropped_assignee: false,
+			dropped_agent_role: false,
+			attachment_count: 0,
+			attachment_bytes: 0,
+			unresolvable_ref_count: 0,
+			...(over.stale ? { source_content_state: 'applied_pending_flush' } : {}),
+		},
+	} as unknown as ItemCopyResult;
+}
+
+// BUG-3230 U1: a copy whose source body was behind its live document says so.
+describe('copyResultToast', () => {
+	it('a clean copy and a clean move are green', () => {
+		expect(copyResultToast(result())).toEqual({ message: 'Copied to Other as TASK-9', type: 'success' });
+		expect(copyResultToast(result({ archived: true }))).toEqual({ message: 'Moved to Other as TASK-9', type: 'success' });
+	});
+
+	it('a stale source on a copy is not green, and says to copy again once saved', () => {
+		const t = copyResultToast(result({ stale: true }));
+		expect(t.type).toBe('info');
+		expect(t.message).toMatch(/^Copied to Other as TASK-9\. /);
+		expect(t.message).toMatch(/may be missing them/);
+		expect(t.message).toMatch(/Copy it again once they are saved/);
+	});
+
+	it('a stale source on a move names the archived original as where the edits are', () => {
+		const t = copyResultToast(result({ stale: true, archived: true }));
+		expect(t.type).toBe('info');
+		expect(t.message).toMatch(/^Moved to Other as TASK-9\. /);
+		expect(t.message).toMatch(/archived original may still hold them/);
+		// Never a promise: a purge or a schema-mismatch rebuild can delete them.
+		expect(t.message).not.toMatch(/still has them/);
+	});
+
+	it('not-unique drops keep their wording (BUG-2367), and combine with a stale source', () => {
+		expect(copyResultToast(result({ notUnique: ['slug "a" is taken'] }))).toEqual({
+			message: 'Copied to Other as TASK-9, without: slug "a" is taken',
+			type: 'info',
+			duration: 10000,
+		});
+		const both = copyResultToast(result({ notUnique: ['slug "a" is taken'], stale: true }));
+		expect(both.message).toMatch(/without: slug "a" is taken\. An open tab/);
+		expect(both.duration).toBe(15000);
+	});
+});
diff --git a/web/src/lib/items/copyResultToast.ts b/web/src/lib/items/copyResultToast.ts
new file mode 100644
index 000000000..2412851af
--- /dev/null
+++ b/web/src/lib/items/copyResultToast.ts
@@ -0,0 +1,46 @@
+// The toast a cross-workspace copy or move ends with (BUG-2367, BUG-3230 U1).
+//
+// Two things can make a copy land differently from a clean success, and the
+// copy's own answer says both rather than folding them into a green toast:
+//   - a value dropped as NOT UNIQUE (BUG-2367): the preview listed it;
+//   - a source body BEHIND its live collaborative document
+//     (`warnings.source_content_state`, BUG-3032): an open tab had edits the
+//     source row did not hold yet, so the copy carried the older body. The
+//     server warns rather than refuses because the source keeps those edits.
+//     On a MOVE the source is archived. Archiving is a soft delete that leaves
+//     the op-log alone, and the dormant GC keeps unflushed rows, so the edits
+//     are USUALLY still with the archived original. Not always: a workspace
+//     purge deletes them, and so does the schema-mismatch rebuild when the item
+//     is next opened after an editor schema bump (collab manager
+//     maybeRebuildOnSchemaMismatch). So the wording says "may", never "has".
+import type { ItemCopyResult } from '$lib/types';
+
+export interface CopyResultToast {
+	message: string;
+	type: 'success' | 'info';
+	/** Undefined leaves the toast store's default. */
+	duration?: number;
+}
+
+export function copyResultToast(result: ItemCopyResult): CopyResultToast {
+	const dest = result.destination;
+	const label = dest.ref ?? dest.slug;
+	const moved = result.source.archived;
+	const verb = moved ? 'Moved' : 'Copied';
+	const parts: string[] = [`${verb} to ${dest.workspace_name} as ${label}`];
+
+	const notUnique = result.warnings.not_unique ?? [];
+	if (notUnique.length > 0) parts[0] += `, without: ${notUnique.map((d) => d.message).join('; ')}`;
+
+	const stale = !!result.warnings.source_content_state;
+	if (stale) {
+		parts.push(
+			moved
+				? 'An open tab had edits to this item that were not saved yet, so the moved copy may be missing them. The archived original may still hold them: restore it and open it, then move it again once they are saved.'
+				: 'An open tab had edits to this item that were not saved yet, so the copy may be missing them. Copy it again once they are saved.',
+		);
+	}
+
+	if (!stale && notUnique.length === 0) return { message: parts[0], type: 'success' };
+	return { message: parts.join('. '), type: 'info', duration: stale ? 15000 : 10000 };
+}