Formatting multiline comments keeps adding spaces

[SuperSandro2000]

Describe the bug
Some multiline comments keep adding spaces when reformatting.

To Reproduce
Steps to reproduce the behavior:

1. Run nixpkgs-fmt on lib/generatos.nix in nixpkgs (NixOS/nixpkgs@a43e629#diff-56d5f4426e78a9b4d1d89abbfe85a6196ea411b7eaddfc51a677e1e4e55c1e91)
2. Repeat that and watch line 213 and 214.

Expected behavior
It does not add new spaces every run.

System information

• nixpkgs-fmt 1.1.0

Additional context
@Kiwi NixOS/nixpkgs@a43e629#diff-56d5f4426e78a9b4d1d89abbfe85a6196ea411b7eaddfc51a677e1e4e55c1e91

[zimbatm]

not sure if it's related but this is also an issue: https://github.com/Kiwi/lol-nix-formatter/blob/master/apache.nix

[Kiwi]

kiwi@mvp-nixos nixpkgs [idempot-not]$ git show HEAD --name-only
commit 2cf58fb5bad385190a2ebcf293953f24ec7142f9 (HEAD -> idempot-not, origin/idempot-not)
Author: Robert Djubek <[email protected]>
Date:   Sat Mar 6 12:52:52 2021 +0000

    find . -name "*.nix" -exec nixpkgs-fmt {} +

lib/attrsets.nix
lib/default.nix
lib/generators.nix
maintainers/scripts/eval-release.nix
nixos/modules/services/mail/roundcube.nix
nixos/modules/system/boot/systemd-nspawn.nix
pkgs/build-support/build-maven.nix
pkgs/build-support/emacs/melpa.nix
kiwi@mvp-nixos nixpkgs [idempot-not]$

https://github.com/Kiwi/nixpkgs/tree/idempot-not

[happysalada]

I have a regression of that bug it seems
https://github.com/NixOS/nixpkgs/pull/129392/files
Running nixpkgs-fmt on the files of the PR will add spaces on multiline comments

[happysalada]

I think @zimbatm opened a separate issue for that #254
After he took a look, it seems to be a different issue