@simon33 Confirmed!
I started a game with 2.2.20868, saved it, and then loaded the file with 2.1.20365 and reproduced the problem. Same thing happened with:
2.2.20868 > 2.0.20234,
2.2.20790 > 2.1.20365, and
2.2.20790 > 2.0.20234.
But it did not happen with
2.2.20868 > 2.2.20790, or
2.1.20365 > 2.0.20234.
So it seems that the update from 2.1.20365 to 2.2.20790 is key. My guess is that, if everyone is using 2.2.x, or 2.1.x or earlier, the problem doesn’t occur. But if there is a mix of 2.2.x & 2.1.x or earlier, the problem surfaces.
Bottom line, everyone should update to the latest version.
Thanks for your help with this!