Trailing comment unexpectedly removed when containing item is skipped

[carols10cents]

Possibly related to #2781 and friends?

Versions

$ cargo +nightly --version
cargo 1.42.0-nightly (f6449ba23 2020-01-21)
$ rustc +nightly --version
rustc 1.42.0-nightly (41f41b2 2020-01-23)

What happened

I have these steps in a repo as well with commits for the different things I tried.

I have some weird comment placement that I'm trying to keep, so I want to skip formatting for them.

Here's the code with the weird comments:

fn myfunc1() {
    println!("hi");      // yes I want my comments here
}       // keep this comment here too

fn myfunc2() {
    println!("bye");        // i want it that way
}    // tell me why

The behavior I'm trying to get is something that doesn't change anything about these comments.

First, I tried skipping each of these functions, but running cargo +nightly fmt still changes the whitespace between the closing curly brackets of the functions and the start of the trailing comments, which isn't what I want:

#[rustfmt::skip]
fn myfunc1() {
    println!("hi");      // yes I want my comments here
} // keep this comment here too

#[rustfmt::skip]
fn myfunc2() {
    println!("bye");        // i want it that way
} // tell me why

So next, I tried changing the attribute to applying to the containing item instead, and this time the last comment gets completely removed:

#![rustfmt::skip]

fn myfunc1() {
    println!("hi");      // yes I want my comments here
}       // keep this comment here too

fn myfunc2() {
    println!("bye");        // i want it that way
}

I expected the last comment to stay there, just like the keep this comment here too comment was left alone. That seems like a bug :(