I somehow got IntelliJ into a state where files in commonTest won't recognize symbols from commonMain saying it can't access them becuase they're internal, but it compiles fine. I feel like I've cleared all kinds of things. Any suggestions?

i've run into some form of that myself

yep

Have this as well but don't know why unfortunately

Did you try to delete .idea folder?

yep

I had a similar problem as well last week. I had to checkout the project again and force a gradle reimport