You'll notice
Useful2 Signal1
Plugin cache cleanup now leaves directories alone if they hold subfolders or links.
What's wrong with this entry?
Anonymous. No account, no email.
What
A directory queued for deletion during plugin cache cleanup is checked again and its contents listed just before removal. If it holds a subdirectory, a symlink or an entry whose type cannot be determined, it is left alone and the reason logged.
Evidence
it still holds a directory, a symlink or an entry of unknown type
Strings lifted out of the shipped bundle, so the claim above can be checked against them.