Bug: labeled tuples with infix operators cannot be formatted

[cod1r]

Describe the bug
labeled tuples with infix operators cannot be formatted

How to Reproduce
Steps to reproduce the behavior:

• What is the formatted file?

let labeled_tuple () =
	~x:1,
	~y:(1 + 2)

let ~x, .. = labeled_tuple ()

• What are the selected options?
  -i

I already have a fix that I want to make a PR from but I guess the contributing readme says to make an issue first. :)

[cod1r]

output after running it on that file

main: Cannot process "/Users/cod1r/temp/ocamlformat_label_tuples_bug.ml".
  Please report this bug at https://github.com/ocaml-ppx/ocamlformat/issues.
  BUG: ast changed.