'error[internal]: left behind trailing whitespace' after closure argument list

[Tastaturtaste]

As the title says, the following code leads to an internal error:

fn main() {
    Some(1).map(|id| 
    // Some comment explaining what I am doing
    id + id);
}

Link to playground: https://play.rust-lang.org/?version=stable&mode=debug&edition=2021&gist=0714c35f8e91a1bb365a8059fa532329
The exact error message:

error[internal]: left behind trailing whitespace
--> /playground/src/main.rs:2:2:21
   |
2 | Some(1).map(|id|
   |                          ^
   |

rustfmt version: 1.8.0-stable

Alternative: This also happens with a linebreak before the second id in the addition
https://play.rust-lang.org/?version=stable&mode=debug&edition=2021&gist=b12719274b196887bbd5691c063a173f

On a cursory skim the only duplicate I found was #2896, which is closed and locked without any resolution. Honestly I am a bit taken aback by the fact this bug from 2018 still seems to be around. I also noticed there are quite a few issues for this error caused by a wide variety of (valid) code patterns. Is there any path forward to fixing these? Is there guidance available if I wanted to try and fix this? Maybe it is already known what would have to be changed?