Minecraft does not handle uploading between dimensions well using a Nether portal, which is the process of sending and receiving information between worlds. This causes processing resources to become saturated, that is, they cannot handle all the tasks assigned to them. As a result, the game becomes slow and unstable.

Analysis

• The player can move and mine, but cannot collect blocks
• The blocks you mine become transparent and ghost, but still exist for the game

• The player can return to the portal after a few seconds or minutes, but risks being attacked by the hostile creatures.

The player's camera	nether	when going to the overworld	upon returning to the nether	at the end of the lag
looking	north	west	west	north
looking	south	east	east	south

As we can see in the table, we can notice that when the problem is triggered, the game maintains the same position of the player's camera when crossing the portal from the overworld to the nether. But then the game detects that something is wrong and when correcting it, the game changes the camera position.The change in camera position can be seen repro.mp4 in since I never moved the camera when reproducing the issue.

the problem will not occur if the camera is facing "the correct side"

Step to reproduce:

1. Open the world https://bugs.mojang.com/secure/attachment/550724/550724_MCPE-174930.mcworld
2. walk to the portal in nether
3. once in the overworld walk forward and then back up to return to the nether dimension
4. At the end of the dimension loading animation, quickly run out of the portal

Expected result:
you move without any problem.

Observed result:
once you do step (4) the game returns you to coordinates 17 70 17.