`doc_auto_cfg` assigns wrong feature to cyclically reexported impl

[alexveecle]

Code

Reproducer in https://github.com/alexveecle/cyclic_doc_auto_cfg

Reproduction Steps

Run cargo doc --all-features and review target/doc/facade/facade_main/foo/struct.Foo.html.

Expected Outcome

The foo function should not be associated to the supporting feature.

Actual Output

.

Version

rustdoc 1.90.0-nightly (28f1c8079 2025-06-24)

Additional Details

We found this issue with a facade crate that reexports other crate modules. The supporting crate also reexports parts of the main crate, which seems to cause this issue.