D7913: Fix T77276: Generating Python API docs raises lots of warnings about duplicate object definitions broke xrefs/links to other types and permalinks in the docs. This makes the python api docs for 2.90 and 2.91 completely unusable.
It got partially reverted in commit e893430a6306ded059270e7df9d78180cdc0d9e3. That didn't fix those two issues though, so it should be fully reverted.
As you can see here, i'm not able to click bpy_struct.id_data, because no <a> tag got generated in the html.
Here you can see a working, but wrong permalink, generated by clicking the little chain. (It should be bpy.types.MeshVertices, not bpy.types.MeshVertices.MeshVertices)