Yep, same problem here. My friend and I just upgraded a modded world from 1.15.2 to 1.16(.1), played a few hours and went to bed. Next morning, we saw that nothing has been saved! So I checked the log files and tried loading without mods, optimized the world and so on. Finally, I came to the realization that it worked perfectly fine in 1.15.2, even without mods, but for the love of God wouldn't in 1.16.
In the end I came to the conclusion that one of the mods had removed the specific structure in its 1.16 release, which makes it impossible to upgrade to the new MC version. The check from 1.15 should be ported to 1.16, why was it even removed?
Yep, same problem here. My friend and I just upgraded a modded world from 1.15.2 to 1.16(.1), played a few hours and went to bed. Next morning, we saw that nothing has been saved! So I checked the log files and tried loading without mods, optimized the world and so on. Finally, I came to the realization that it worked perfectly fine in 1.15.2, even without mods, but for the love of God wouldn't in 1.16.
In the end I came to the conclusion that one of the mods had removed the specific structure in its 1.16 release, which makes it impossible to upgrade to the new MC version. The check from 1.15 should be ported to 1.16, why was it even removed?