Chunks Crashing

[fluid wing]

Server is currently on Terralith_1.21_v2.5.2 and it is a 1.21 paper server. I can provide more info if needed.
If anyone has any idea how to fix the chunks or what is actually causing it id be greatful. So lost with this.
Additionally if you think that updating the data pack will fix this, we are wondering if the world file will save.

[scenic yarrow]

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[waxen jasper]

update to 2.5.4

[fluid wing]

Thank you for the help