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As witch huts use flag "liquid_surface", place_on only can be water. If we want on-shore witch huts, this needs to be solved differently. Also, probably no witch huts in deep ocean swamp water? Reviewed-on: https://git.minetest.land/VoxeLibre/VoxeLibre/pulls/4605 Reviewed-by: Mikita Wiśniewski <rudzik8@protonmail.com> Co-authored-by: kno10 <erich.schubert@gmail.com> Co-committed-by: kno10 <erich.schubert@gmail.com>