[1.12.2] BetterPortals Crashes when player died in other world will stop server.

[E1xP]

Describe the bug
The server using CatServer as server core. And the BP running nice beside when player go to other world and die. It seem not notice the sever about player change world and cause respawn process throw excenption. It seem to be a communication problem bettween mod and server.

Crash Report
https://pastebin.com/Rb9q8QLE

ScreenShots

To Reproduce
If applicable, the steps to reproduce the behavior:

1. Install BetterPortals with Furnature Mod
2. Create a Nether portal and go through it.
3. Got kill in other world.
4. Click the respawn button.
5. At Client side should timeout and the server side should see a throw exception and server quit.

Please complete the following information:
- Minecraft Version: 1.12.2
- Mod Version: 0.3.7.7

Footnote
And i also reproduce this problem at Magme core. At magme core it seem they have a fix at 9 jul 2020.