Last night (6/27/21) I started a new Realm on a new world with 7 other people on at the same time. We were on the world for exactly 30 minutes and then it crashed, causing us to lose all our progress since no backup was made during that time. We restarted and it crashed again at the 30 minute mark exactly. There should be too much strain on the server caused by us since we were barely loading any of the world, only had 8 people, and bad minimal, unobtrusive data packs mostly from Vanilla Tweaks.

I was able to get around this issue by switching which world the realm was playing on every 20 minutes since it would then make a backup. It wouldn't crash so long as I switched world but I'm unsure if it will crash again if I stop. I also tested to see if it would crash if I played on an old realm world I had and it did not crash after 30 minutes.