Looks like mine got duplicated to this one. It seems like perhaps the new render dragon can not handle too many entities in one area? On a realm I have a base that, besides the basics needed for a survival base (small farm, some animals, a couple of iron golems, building) I also have three machines. Two for generating different wood, one for bonemeal. They are not small machines. However before the update to 1.18.30 there was absolutely no issue. Not even any lag. But now in trying to approach that base, it crashes the game. Doesn't matter if I try to go through its nether portal or travel there normally. Under normal travel, the first noticeable thing are mobs no longer moving, and being unable to interact with anything. I can't even get close enough to try to dismantle the machines to see if it would help. (Except once. That is, I got close, right in with the machines, but could do nothing about them before it crashed. There is no corruption to see. No missing chunks etc.) The realm crashes after that, and when it is next up, I am back at the last saved point. When someone else is on the realm and goes to that base, even though I am no where near it, the same thing happens. All mobs stop moving, can not interact with anything, and then...crash.
On the video where I went through the nether, the original video was 7 minutes long of.... just that screen and nothing happening. Obviously I had to shorten it to upload it. And then when trying to log in after, you get the purple 'joining realm' that lasts forever until it says it can't. Do that a few times till it is up and running again, and it goes to the last saved point
Steps to Reproduce:
Build a base on a realm before 1.18.30 that has at least 3 machines (bonemeal generating, 2 wood generation) Also various buildings with the usual items needed for survival. Like storage, work area, bed, small farm, a few animals and a couple of iron golems.
Update to 1.18.30
Try to return to the base
Observed Results:
Attempt to return to base... crashes the realm. Attempt to return to base through nether portal... crashes the realm. Attempt to return to base by teleporting in creative... crashes the realm. Try to fly in creative to the base... just be able to see it, observe all mobs ceasing to move and.... crashes the realm.
Expected Results:
Would be to go to the base as being able to before 1.18.30 without it crashing the realm.
Whitemist said "Prior chunks to 1.16.1 had problems, but new ones don't." But my problem that seems to match this is from being built in 1.18.12. Not all that long before the patch to 1.18.30.