Heads up friends,
Found a bug in the new release (as of this writing v8.33.0.9445) where you cannot edit or create new filters that uses the “is_empty” condition on a Thumbnail field. Filed a case with support, will update if I hear anything about a timeline on a fix.
Support noted they’re aware, though no ETA on a fix.
Oh wow I assumed that was just me misremembering its existence! I haven’t tried to use it in a while.
Support has confirmed that the bug is in QA now.

Don’t see release notes yet, but this appears to be fixed! v8.34.0.0924 as of this writing. Thanks for getting the fix out!