Project Zomboid: Build 42.21 moved to stable branch

The developers announced the stable release of Build 42.21. Fixes include zombie behavior and the visibility of large trees.

Before continuing the old world, copy your saves and the list of mods. Check which branch the server and clients are using: moving to the stable branch does not negate the need for compatibility. After the update, replay a familiar trip or situation where the error occurred. Reporting corrections does not mean eliminating all similar cases, so it is useful to keep new observations separately.