In each of the above versions, starting in 17w47a, structures like the Woodland Mansion don't generate properly due to named ids being changed because of the flattening. The screen shots above show the majority of the structure missing seems to be planks and logs.

I haven't checked other structures yet but I will assume this affects all structures and that it is a bug caused by the change.

Can't seem to find any structure bug reports or mansion reports (at least of the specific nature) that touch on this. And it has been around since 17w47a. (The "flattening")

Temp workaround until fix is to use datapacks with fixed block ids.