yeah that can happen when next hits a compile dead-lock after a version bump.
first thing i’d check is if there’s anything hanging in the route tree or a bad import loop.
you can run NEXT_DEBUG_COMPILATION=1 next dev to see where it stalls that usually points to the file that’s locking the compiler.
also try blowing out .next, node_modules, and the lockfile, then reinstall clean. stale react rc builds can get weird with minor next bumps.
if you can repro it in a small repo, even better that narrows it fast.

happy to take a look if you wanna share a snippet or a minimal repo.