according to AI (im not a professional but this is what AI said according to the crash logs):

The ZombieDungeonLegProcessor attempts to generate a structure at an invalid position. The call to Chunk.getHeight() returns -1 (indicating coordinates outside the valid chunk area), which is then used as an array index, causing an ArrayIndexOutOfBoundsException.

java.lang.ArrayIndexOutOfBoundsException: Index -1 out of bounds for length 24

seed: 1450955260984977362
chunk of issue: X=727, Z=99

Crash Logs:
https://mclo.gs/Ltv0hnC

I do have a lot of mods in my modpack but currently the culprit is Better Dungeons.
If needed i can provide my Modrinth modpack that will include the world if needed since the issue persists (will use modrinth to pack the modpack into a .mrpack)