presence of lint attributes changes const block formatting

If I ask cargo fmt from 1.81.0 to format this code, I get:

const COUNT: u8 = 5;

pub struct Thing;

impl Thing {
    pub fn set() {
        #[allow(clippy::assertions_on_constants)]
        const {
            assert!(COUNT == 5)
        };
    }
}

Under 1.80.0 I get:

const COUNT: u8 = 5;

pub struct Thing;

impl Thing {
    pub fn set() {
        #[allow(clippy::assertions_on_constants)]
        const { assert!(COUNT == 5) };
    }
}

Weirdly, if I remove the lint attribute, then both 1.81.0 and 1.80.0 format the const block on a single line.

I'm on Ubuntu 22.04, with no rustfmt.toml and the rustfmt versions are:

$ .rustup/toolchains/1.80.0-x86_64-unknown-linux-gnu/bin/rustfmt -V
rustfmt 1.7.0-stable (0514789 2024-07-21)
$ .rustup/toolchains/1.81.0-x86_64-unknown-linux-gnu/bin/rustfmt -V
rustfmt 1.7.1-stable (eeb90cd 2024-09-04)

Start by reproducing the example with rustfmt 1.7.0 and 1.7.1 on the provided Rust code, comparing output with and without the lint attribute. Trace the formatting path for attributed const blocks and add a regression test showing the expected stable formatting across these cases.