Comment indentation/alignment changed in Rust 1.81

When I updated to Rust 1.81 I noticed that the comment indentation changed. Not sure if this is an intentional breakage or a bug.

I have the following code (formatted with Rust 1.80.1, rustfmt 1.7.0):

enum Enum12 {
	Fn,
	NotEquals,
	Backslash,
}

fn parse_symbol2(ch: char) -> Enum12 {
	match ch {
		'=' => Enum12::Fn,
		'\u{2260}' => Enum12::NotEquals,       // unicode not equal to symbol
		'\\' | '\u{3bb}' => Enum12::Backslash, // lambda symbol
		_ => todo!(),
	}
}

.rustfmt.toml:

hard_tabs = true

When I updated to Rust 1.81 (rustfmt 1.7.1) I got this diff:

diff --git a/src/lib.rs b/src/lib.rs
index 634b281..edc0fca 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -7,7 +7,7 @@ enum Enum12 {
 fn parse_symbol2(ch: char) -> Enum12 {
        match ch {
                '=' => Enum12::Fn,
-               '\u{2260}' => Enum12::NotEquals,       // unicode not equal to symbol
+               '\u{2260}' => Enum12::NotEquals, // unicode not equal to symbol
                '\\' | '\u{3bb}' => Enum12::Backslash, // lambda symbol
                _ => todo!(),
        }

Strangely the bug seems to be very dependent on the length of some of my identifiers. If I change the enum name to Enum or E the formatting difference goes away. Are comments like this meant to be aligned or not?

Reproduce the formatting difference using the provided src/lib.rs example and .rustfmt.toml with Rust 1.80.1 and Rust 1.81. Compare how the inline comments are aligned for the different identifier lengths. Done means the intended alignment behavior is established and the regression is covered by a project test.