I just want to point out that nvidia shadowplay didn't record my cursor, so it can be hard to know where I clicked. But you know that I didn't click the end turn button as no sound effect pinged.
Turn ends prematurely after hovering over the end button. https://streamable.com/2e6xy
Another example of the same happening. https://streamable.com/n1cog
This example is slightly different as I didn't hover over the end turn button. Suggesting that the bug may have nothing to do with hovering above the end button. My turn ends in the middle of my trading. https://streamable.com/ctjn8
Note: This is now a thread on turns ending prematurely - Austin