I played multiplayer game (2 humen/4 AI) with one other guy. I had the Forgotten, he played the Wild Walkers.

He finished the Auriga Museum, but I had the message i did, even I had still one more turn to finish it. This didn't happen the first time, but this time I have the requested data for bug report.

Reloading save leads to the same bug.

Save files (turn before and at the point bug occurs):

Bug Auriga Museum - Zug 21.zip

Bug Auriga Museum - Zug 22.zip

Diagnostics:

Diagnostics.zip

Output log:

output_log.zip

Would be nice to fix that "old bug" (from my experience).

Edit:

Specs:

Acer Predator G9-792

OS: Windows 10 64 Bit

Processor: Intel (R) Core (TM) i7-6700HQ CPU@ 2.60GHz

RAM: 16,0 GB

Graphics: NVIDIA GeForce GTX 970M

Game version: V1.5.7 S3 (64-bit)