i don't know if this is a universal fix but i managed to stop the crashing by removing the "in_square" function from the features that were causing problems (lakes and random patches)
After further testing and reading through crash logs, it appears this is being caused by the placed features "cynic:pond_sandy" and "cynic:pond_muddy". A different world created with the seed set to 6576703358490591178 caused the crash at around coords -2234, 79, 1160 (a swamp biome). An edited version of the data pack with the pond features removed from their respective biomes did not result in these crashes.
i don't know if this is a universal fix but i managed to stop the crashing by removing the "in_square" function from the features that were causing problems (lakes and random patches)
After further testing and reading through crash logs, it appears this is being caused by the placed features "cynic:pond_sandy" and "cynic:pond_muddy". A different world created with the seed set to 6576703358490591178 caused the crash at around coords -2234, 79, 1160 (a swamp biome). An edited version of the data pack with the pond features removed from their respective biomes did not result in these crashes.