As of 21w06a, when teleporting long distances (completely out of the previous render distance in x/z) with commands, one of the following bugs may occur:

• All chunks will fail to render except for a 3x3 square centered on the chunk the player is in.
  • Moving the player's position or view angle or toggling perspective fixes this bug.
• All chunks fail to render
  • Moving around may address this in some areas (see the screenshot of the gaping hole in the landscape, centered on where I teleported to), but a world reload is required to completely fix things. F3+A does not seem to help here.

Note that entities in these chunks do render correctly.