Smart Mail Boxes broken in Big Sur?

I've had a SMB for years for all today's message, including Sent. The settings are:

All messages

Date received is within last 2 days

Messages are not in Junk

Messages are not in trash

Include messages from sent

For the last several months I've been using it on a MBP running Big Sur without problems. A few days ago it stopped displaying Sent messages. I deleted the SMB then rebuilt it. Same problem. I also tried rebuilding the Sent mailbox. No change.

Could re-indexing Spotlight fix this? If so, should I just re-index the V7 folder in user/Library/Mail?

Ken