Got this "Turn pending" Icon on the bottom right after attempting to end my turn. I let it hang for like 10 minutes, but nothing happened. Attempted to go to game settings to save, but the UI then disappeared. Had to alt-F4 to exit the game.

Loving the experience, just a hiccup.

I have same the problem... The Problem first appeared on Turn 446 (Modern Era). After that, i tried manually saving and then loading this Savegame but it didn't helped.

Then I loaded a bit older Savegame (Turn 436), which then also had the error, although the Savegame was okay before the Bug appears.
I had to go back almost 50 Turns, before I found a usable Savegame. Only to find out that the error pops up again later (Turn 521).

I almost have the Impression that it is due to the Amount of Information (Number of Cities, Number of Units, Mapsize, Buildings done at the Turn, AI Movement at the Turn, etc.).

Otherwise the game runs flawlessly in 4k and the highest Graphics Settings (i7 9700k, RTX3060 12GB, 16 GB DDR4 RAM, WIN 10 Pro).

I'm really annoyed, yet. I had really much Fun with the Game, but it is unplayable at the Moment.

same, happened on 3 different saved games now. always had to start over... no solution online