Minecraft wiki entry for Development_versions, associated text: Removed small_portal_statue, intact_horizontal_wall_stairs_upward, top_piece, bottom_piece and variant structures because they duplicate existing structures.
Changed some structures:
Slightly changed city_center_2 blocks around the chest so that vibrations generated there are always detected by the sculk sensor below.
A missing sculk sensor was added for the redstone lamp in bottom_1.
Replaced the light blue and blue carpets in ice_box_1 with gray carpets, and the trapdoor there is no longer open by default.
entrance_path_5 is now able to generate.
Changed the loot found in chests:
There's now an extra roll of loot for every chest, with one possible loot option being now 1-3 echo shards.
Replaced the golden carrot in city_center_2 chest with a golden apple.