[Lava]

I see. That's fine! I understand that unfortunately that Classic UI mod is quite finicky (no WeiDU, no longer maintained...). It seems that removing mapicons.bam from it did the trick and doesn't break anything, but I realise that there might be other issues with aspects of the GUI.

Yeah, it may be risky.

Just to confirm though, is it working as intended that the "Mountain Cemetery" area shows up on the (regular BG:EE) world map from the start? Or possibly a sign of another incompatibility?

IIRC, it should show up as grayed out. There is no quest that directly leads people there, and I wanted to motivate player to find out how to reach that mysterious place.