Yes, structures do seem to generate normally, however the world seems to stuck on 1.17.40 generation as is the case with old worlds
happens to me on pc too
when I tried with 550+ maps the file size only went up by about 1 megabyte
I opened another old world in the current version 1.20.15 that I last saved before this bug took effect and the extra terrain is still added
this seems to have been fixed in a recent version(this is my old survival world)
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