Not sure this is new! But it is the first time we are attempting to trigger a raid with the command /give effect and we are crashing when it is applied to more than one person. Maybe this isn't a bug? Dunno!
I gave the effect to all three of us playing, and the server crashed. This log is a third crash, after running the command again, and then setting it to night to allow the players to set their bedspawn.
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Momibelle
I had already up'd the server tick time.
We have been having LOTS of ongoing lag and crash issues with only a few people in the game. This doesn't make any sense.
We are also playing with 5GBs RAM, so I really don't get what's going on.
:/
Anna
Try the fix in MC-63590.