Rustdoc `--sort-modules-by-appearance` sometimes doesn't respect order

Code

/// should occur first
pub use std::mem::drop;

pub use inner::yyy;

mod inner {
    /// should occur second
    pub fn yyy() {}
}

Reproduction Steps

run rustdoc with -Z unstable-options --sort-modules-by-appearance

Expected Outcome

drop should occur first, yyy second

Actual Output

yyy first, drop second

Version

rustdoc 1.94.0-nightly (806c2a35d 2025-12-19)

Additional Details

If i replace reexported drop with a locally defined exported function, the issue doesn't occur.

Start by running rustdoc with -Z unstable-options --sort-modules-by-appearance on the provided Rust snippet and confirm the re-exported drop appears after yyy. Trace the rustdoc handling of this option, then add coverage showing that the re-export preserves source order and verify that the output lists drop first.