This is a modded block I added with a bunch of overlapping VoxelShape objects that get combined with VoxelShapes.union. I think the VoxelShapes.union function could be at fault, though there may also be an issue with the way particles are spawned for each VoxelShape.
Yep, it is a duplicate. I’ll close this now.
I just realized the modded block uses a bunch of overlapping hit box parts that are unioned together. i think it’s probably a bug with the union function in that case.
This bug is caused mainly by bad programming that mojang refuses to fix even though it isn't hard to fix. As a workaround, you can use the fabric modloader with the fabric API installed, or you can use java 8.
I have had this same issue, and when I reset the minecraft files (to log out of Xbox live) it started working again on my iPhone 6s with iOS 13.
Confirmed with 1.17.1