The Woodland Mansion structure files has a duplicate:
mansion/room_templateis the same as
mansion/1x1_a1My suspicions lean towards room_template being the unused one, as all other rooms share the same name style (lenght x width _ version number).
MC-108159
Duplicate structure file of woodland mansion room
Resolved
Fixed
3
Confirmed
duplicate, file, mansion, room, structure, woodland, woodland-mansion
Minecraft 16w39b, Minecraft 16w39c
Minecraft 16w44a
Retrieved
Assigning to Grum instead, because he was talking about getting rid of the template room.