After triggering a Raid and finishing the Raid Boss - or even sometimes during the Raid itself - first, those two lines appear in the server console:

[11:34:50] [Server thread/ERROR]: POI data mismatch: never registered at BlockPosition{x=-267, y=65, z=278}
[11:35:36] [Server thread/WARN]: Can't keep up! Is the server overloaded? Running 5808ms or 116 ticks behind

Then, the server crashes 30 to 60 seconds after with the crash logs below.

I've appended 3 logs of three following crashes during one raid after the automatic restart of the server.

After defeating the Raid (sometimes multiple times because the world resets a bit after a crash obviously) everything went back to normal.