I have been using a data pack to extend the height of the world in one of my worlds. When I tried to upgrade it to 22w06a and 22w07a, the game reported errors in the data pack despite it loading perfectly normally in 22w05a.

To reproduce, apply this data pack to your world. It works in 22w05a but not earlier. Not that you might need to apply it after the world is generated in order for it to work in 22w05a, but that's fine.