Sins of a Solar Empire Rebellion: your galaxy scenario file differs from host saved game after latest patch

Since the last patch I cannot join saved multiplayer matches and other players cant joined saved matches hosted by me,
we get the error message "your galaxy scenario file differs from host saved game" every single time we tried.

I already tried:

Re-installed the game via Steam
completely deleted the Sins folder under My Games and re-installed
no mods are installed, never were on this PC
changed languages in game and in Steam
disabled Cloud saving
tried all available Beta versions (multiplayer disabled)
launched via Dev exe
transferred friends save game to me and tried that way

None of this worked.

PC Specs: Win10 Home, 16GB RAM, GTX1660 Super, AMD Ryzen 5.

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We tried to exchange save files again via Discord.
The save game file names got renamed by Discord, but strangely it worked.

But still, that cannot be the solution that we have to manually shuffle save games around.

Somehow I suspect that some savegames are not created or not properly created on my side.

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