P: "None" doesn't appear in Library Filter bar Keyword column until restart

Thank you for following up. This is not an issue any more. I was not seeing "none" as filter option because there were no photos without a keyword.

Please post a full-resolution screenshot of the entire LR window showing what you're seeing, along with the first seven lines from the menu command Help > System Info.

Hi - This issue reappeared for me today after upgrading Lighhtrrom Classic to 12.2.1, i.e. the Library Metadata Keyword filter no longer shows "None" as a keyword option.

The problem is fixed in my LR 10.2 / Mac OS 10.15.7.

Thanks..............

We've logged a bug for this with the team. Thanks for the reports.

I can duplicate this issue.   To expand on the issue, NONE does not update after an Import.  If you had 10 photos without keywords and import 4 new photos and then select All Photographs it will still say 10 by NONE.  If you change one keyword then it will update and not require a restart but this shouldn't be necessary.  

BTW, if you create a Smart Collection that tests for NO keywords it updates correctly after the import

Eric, I edited the terminology in your post slightly to clarify.

Not for me.  Just now, I tried turning off the Library Filter, waiting for 30 seconds, turning it on, switching to All Photographs and particular folders and collections, choosing a different column (Date and File Type), adding the Keyword column from the drop-down menu rather than relying on my custom filter preset.