I hope it has not been reported, I can't really read all 57 pages.
Playing v26 here (with patch 1), it all started last evening.
I was trudging about in my prehistoric Navajo game, just after researching animal husbandry, when one of my unit ( a hunter) started to have a strange behaviour. Sometimes after moving the unit would become "invisible". Still showing up in the tooltip if I hover the cursor on the tile where the unit is, but invisible, and unable to attack. After saving the game I decided to restart Civ and reload, and indeed that behavior did not reappear.
BUT, now 3 times out of 4 when I load a savegame (ANY savegame, even much much older ones), and click the Toggle show all resource display, more than half of the resource icons do not show on the map. Closing in on the map the resources are still showing, and I think the tile outputs are correct, but still it's quite inconvenient.
Now considering it also happens with old saves, and that it did not happen back then, I think it rather likely that somehow the game and/or the mod installation became corrupted, because it's not likely that that older savegames are also affected since they worked perfectly back then. And no, clearing the mod cache (all the files in the Cavemen2cosmos/assets/cache folder) doesn't help...
Still I am posting here to ask for suggestions, to attach my savegame in case it helps, and to ask if you want me to try anything before I reinstall the mod and/or the game.
EDIT: Also, can someone tell me if the resource distribution is normal? I chose a continents, balanced setup, but I notice an extreme scarcity of things like sheep, pigs, cows