See first screenshot with region set to is null w/ greyed out “apply” button vs second screenshot w/out is null condition with clickable "apply button.
Hi @Jake_Powell ,
Thanks for reporting this to us and apologies for the inconvenience it may have caused.
This is a bug on our side. We’ll inspect to work on a fix and let you know when it’s released.
In the meantime, you can try creating a case-when using custom formula.
Great, and thank you for the work-around in the meantime. Happy bughunting!