Crash when an animated structure is loading and going to another dimension

Steps to Reproduce:

1. Download and open My World.mcworld
2. Open the structure block
3. Press the "Load" button
4. Enter the nether portal or end portal

Observed Results:
The game crashes.

Expected Results:
The game should not crash.

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Original Description:
Every time when a animted structure is loading by structure block if you go while that it will crash your game right away