Ten tests ran the real projectsend:update, which runs clear-compiled, which deletes bootstrap/cache/packages.php and services.php -- one copy for the whole checkout, shared by all eight workers of a parallel run. A worker booting in the window between that delete and its own rebuild reads an empty package manifest, registers no package service providers, and dies rendering the next page with "Target [Inertia\Ssr\Gateway] is not instantiable", in a file that has nothing to do with updates.
Verified here rather than taken on trust: a probe running the real update inside a test on main deletes the manifests, exactly as described. The branch is green at 2066 with PHPStan clean, and touches no application code.
The file already owned a double and explained why the artisan call is a seam; this extends it to the whole file and adds a test asserting the compiled caches survive.
Reported and fixed by @denkfabrik-li.
Ignacio Nelson
76f79d53a0