Updating world from older version to 2.6.1 causes issues with world corruption

[Zalert]

Your GTNH Discord Username

zalert.

Your Pack Version

2.5.x -> 2.6.1

Your Server

SP

Java Version

Java 8

Type of Server

Single Player

Your Actions

after updating my game from 2.5.1 to 2.6.1, now my world always crashes after loading in for a split second. https://pastebin.com/TTdKKdBR here is the crash report^

Once crash occurs game can't load any worlds without restarting it.

I used mcedit to delete the chunk containing the coords mentioned at the top of the log:(1435, 35, 611) deleting angelica didn't change anything.

using a backup of the world from 2.5.0, made 4 months ago results in the same crash https://mclo.gs/NK7YPOY

Of additional note. This world once had a chunk corruption issue in the coord noted above, a long time ago. Deleting that chunk fixed the issue several versions back. And the world still works on 2.5.0 and 2.5.1, this issue only occurs again once I attempt to join these worlds in my 2.6.1 version.

Crash Report

2.5.1 -> 2.6.1 https://pastebin.com/TTdKKdBR

2.5.0 -> 2.6.1 https://mclo.gs/NK7YPOY

Final Checklist

• [X] I have searched this issue tracker and there is nothing similar already. Posting on a closed issue saying the crash still exists will prompt us to investigate and reopen it once we confirm your report.
• [X] I can reproduce this crash consistently by following the exact steps I described above.
• [ ] I have asked other people and they confirm they also crash by following the exact steps I described above.

[github-actions[bot]]

Found 2 linked crash report(s)

Primitive Automated Analysis of Crash Report

https://pastebin.com/TTdKKdBR This crash report suggests world corruption. Try restore from a backup.

Primitive Automated Analysis of Crash Report

https://mclo.gs/NK7YPOY This crash report suggests world corruption. Try restore from a backup.

[chochem]

duplicate of https://github.com/GTNewHorizons/GT-New-Horizons-Modpack/issues/16531