I have 2 computers, a PC and a laptop. On both, I am getting "invalid resource" error for anything in water. Pearls, oil etc. This happens with maps I try to make or maps I try to edit. I downloaded a few popular maps (real world locations like Europe/Mid East) and it seems some people get the bug and other do now, as one had the pearls/oil in the water and others had them on a land tile next to the water to avoid the bug. I assume it's a recent update that broke things? Or is it something I am doing wrong? 

It's an old issue, see:

https://www.games2gether.com/amplitude-studios/humankind/forums/215-bug-reports/threads/46407-ki-issues-with-map-editor-after-beta-patch?page=1

Just tested, still not fixed in the last patch.