20w19a, 20w21a, 1.16 Pre-release 2
The affected structures are:
- Note that this structure is separate from starting_pieces/stairs_0_mirrored. They have different structures and the latter does indeed generate.
None of these stairs are in any hoglin stable jigsaw block pool. They would generate just fine if added to their respective pools being mirrored_starting_pieces for the first and stairs for the second and thirds. They have jigsaw blocks set up similarly to other stairs in these pools.