When decreasing world height using a datapack in the latest snapshot the game crashes. Removing the datapack does fix this again

In previous versions, doing this correctly truncates the chunks with no crashes or other major issues (although log errors are thrown each time a chunk is loaded for the first time after the change).

This may simply be unsupported behaviour, but the inconsistency with previous versions suggests an underlying technical change - if this is intentional then that's fine but it would be nice to have clarification, and/or a warning when loading the pack