Hey,

Since the release of version 1.17: Caves & Cliffs Update: Part I, I have had the same problem several times.
The problem occurs during a change of dimension:

> After taking a portal, be it Nether Portal or Ender Portal, once the player has entered the desired dimension, only a 2x2 chunk area is loaded and visible to the player. This leaves a void at the edges of this area and is very disturbing when we change dimension.

I tried reloading the chunks (F3 + Q), but it didn't work.
The only solution I had was to leave and join the world right away.

I haven't been able to "try" this problem on a public server, but in Solo mode it happens to me every time.

Good luck for the future,

Alt3rn__

+Other notes:

+- I've already opened a ticket for that, but it was in french, so I post that here in english

• I didn't find something else about this bug.
• I can't put a video of my bug, the limit is 10.00MB