I had MC-94588. I deleted the corrupt chunks with MCedit. The chunks regenerated, but without structures. (no trees, no lakes). (this is only true for a few chunks.)
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...and since you had that, this is also a dupe of MC-2548.

Structures from one chunk can overlap into other chunks. The structures that did not regenerate belonged to a chunk that you didn't delete.

Yes I know that, but for mc, the deleted chunks are the same as if they never existed. (lakes and trees are only stored in the region files, not the structure files) And chunks generated for the first time contain structures, so regenerated chunks why not?
Also, this is not duplicate of MC-2548.

The fact that a chunk was cleared is MC-2548. The fact that lakes/trees are cut off and did not regenerate is working as intended.

ok, i get it.