Falling blocks at chunk generation cause tons of entities and (client-side) lag

WDL: https://www.mediafire.com/file/uk4fd1eidqwwtme/1.17+Farms+and+Machines+WDL+-+Copy+(5)+-+Copy+-+Copy.zip/file

Is there a way I can reproduce it? It seems like a major bug if this happens in survival. Can I get the seed rather than the world download it would be faster for me if I could just get a seed. Do /seed in your world and Copy it and paste it here. You should be able to do the /seed command in survival. I could then used your Coords from your screenshots to locate that area. thanks. - Jared

Can confirm. I attached some debug profiles, they show clearly that the lag is client-side only and primarily caused by the many falling block entities.

Seed: -4179224576850783373
Coordinates: /tp @s 9014 73 12245

I'm actually unable to reproduce this issue by creating a new world though... it's just the world download that's causing the lag.

The world download does say farms and machines. Are there farms and/or machines on that world that could cause this type of lag in the world file? It might be the case as he went to that area one of the builds he made bugged out.

it's some falling sand/gravel during world gen. nothing to do with world name.

You were exploring a world in survival right? I think I'll try to attempt the walk to that area in Survival using only the seed if that's the case. Might have to do with a certain amount or specific chunks needing to be loaded for the first time to get the bug rather than just a tp? Also what render distance and simulation distance did you have? Just incase that might have something to do with it too.

This ticket relates to MC-241757

I think its fair to say that this is a duplicate or really similar to MC-241757. I didn't get as much lag from the falling sand or whatever it is. And if there was none in the screenshots. There are Sea Temples Really Close to the coords given in the same seed of the world download. So its possible the bug in the world download is due to the temples bugging out with falling entities. Btw I basically boated all the way in survival to the coords given and found the temple first and almost died at it too.

If anyone Can see if there is temples with the falling entities bug In the world download I think its safe to say its a duplicate

Also this is an excellent seed for Weird terrain gen. Found a couple of the old bugs I reported still going strong from this seed. This was really fun to find!