The desktop extensions check whether or not to symlink libraries based on the contents of $SNAP_USER_DATA/.last_revision. Because $SNAP_USER_DATA is versioned, after a snap is reverted, the desktop-launch script will check .last_revision, but it will always match the (now) current revision. This leads to broken symlinks that point to a revision more recent than the current revision (since they are not updated after a revert). This issue also affects the ubuntu/snapcraft-desktop-helpers repository.