As we know,minecraft java edition could have custom dimensions but bedrock edition can't,so I trying to make a addon to imitate it,after I updated my game,I found that my game will became laggy during my test.I created a new world and just set some command blocks(without any addons),my game still became laggy,so I think that I found a bug.
I also add the test world below this issue,you can test it,too.let me introduce this world file.

Steps to reproduce

1. Load the attached world.
2. Join the world. In the overworld you can find an end portal and two command blocks. One command block can add a "test" tag to player and the other command block can remove the "test" tag. In the end there is a stone platform far from the obsidian platform. A repeat command block next to the obsidian platform teleports any players with the "test" tag from the obsidian platform to the stone platform.
3. Enter the end portal when the player doesn't have the "test" tag. Teleport to the stone platform manually using the impulse command block. The game runs normally.
4. Go back to the overworld.
5. Enter the portal when the player has the "test" tag. Loading the end dimension will take longer, you will teleport to the stone platform, and the game will take many seconds to respond with server-side events to player actions. For example, block breaking particles do not appear, you can stand on the end portal that is on the stone platform, and when you press the button to remove tags and teleport back to the obidian platform the button will remain depressed for several seconds.
6. Go back to the obsidian platform by pressing the button to teleport and remove tags. Then go back to the stone platform as in step (3). The game will have reverted to normal.

Expected results

You can be teleported away from the obsidian platform without massive lag/desync.

Observed results

Massive lag/desync lasting seconds or minutes when you are immediately teleported away from obsidian platform.