We spent several months looking for this bug. In parallel, several other problems were found and fixed. Now we hope that the game works as stable as possible.
If you turn off the celebration animation, you can turn it on. Those players who have disabled optimization in a separate utility can also enable it again.
In addition, we fixed an incorrect calculation of starting Reputation for the specific case of creating a campaign with a small number of countries.
Have fun!
ːnationalcupː