Ummm, okay nevermind, this is my fault…somehow.
I just started making a new theme. I noticed had this before but didn’t realize it was dark theme only.
Checking my theme color settings, I found this entry which is directly creating the issue:
But I have no idea how that got in there. This element (.header {}sidebar) doesn’t exist in the Light theme. I can’t figure out how I could have accidentally created it with an errant copy/paste…but it appears that’s exactly what I did.
So…I guess this is a total non-bug. Sorry for posting it before understanding it.
