After the teleportation fails, the nether portal will not teleport no matter how many times the game is turned off and reopened, but other animals and fallen objects can be teleport.

Except for suicide and returning to the main world to restore the game, but the same problem still happens often.

When returning to the main world normally with the original nether portal that I built, but I see the other nether portal generated nearby that I never used. However the original nether portal still linked to the nether.