Recently when going through nether portals on my realm, they will take the player below the nether portal. This sometimes results in the player being stuck in blocks under the surface. It seems to only be when travelling from the nether to the overworld. It is reproducible but not consistently. It seems to happen more to chunks that have not been recently loaded, it happens more frequently the first time you go through that portal after logging in.

Minecraft 2024-08-04 21-26-21.mp4

This is an example of going through a portal and spawning underneath the portal in the overworld, becoming stuck in blocks.  

Minecraft 2024-08-04 21-28-16.mp4

This is me going back through the same portal right after that, and getting strange world generation again but this time spawning in the correct position.

Minecraft 2024-08-04 21-13-09.mp4

This is a different portal with the same issue, when I go through it I fall through solid blocks.

I can provide more videos or information if needed.