I'm working on the 40 m band. I've been using a fairly low audio frequency, maybe 1200 Hz or so.

I use Settings / Radio / Rig Options / Split Operations: Rig.

I use the JS8Call-improved frequency UI (under the big QRG display in the upper left corner) to change to the 20 m band.

Expected and seen: The Frequency changes to 14.078 kHz, both on the screen and on the rig's display. But the split frequency is still at 7.077.

I hit the "tune" button.

Expected: The rig sends a test signal in the 20m band.

Actually seen: The rig sends a test signal back in the 40 m band.

Workaround: Click a high audio frequency, like 2200 Hz, and hit tune again.