X-Axis configuration defect?

All - I am pretty sure this is a defect but wanted to see if it's just me. On the left is a stacked bar; on the right is a stacked bar/line combo. In both charts I am using a calendar hierarchy of Year > Month. On both charts the "Concatenate Labels" option is turned off. 

If I fool with the Concatente Labels for the Stacked Column only chart it will toggle back and forth. Changing the option for the bar/line combo chart has no effect.

I am on the June 2022 release.