Bug: Custom Indexing Operators are sometimes re-ordered

[mseri]

Describe the bug
ocamlformat moves around the extended indexing operators (https://caml.inria.fr/pub/docs/manual-ocaml/manual042.html) if the module containing them is not open in a bigger scope. I attach here the diff from a recent owl example, and below a small repro:

-        sol_planets.Mat.${[ []; [ 3*i ] ]}
-        sol_planets.Mat.${[ []; [ 3*i + 1 ] ]};
-
+        (Mat.( .${} ) sol_planets [ []; [ 3 * i ] ])
+        (Mat.( .${} ) sol_planets [ []; [ (3 * i) + 1 ] ]);

How to Reproduce
Steps to reproduce the behavior:

• What is the formatted file? Please try to minimize the code snippet.

The following code

open Owl

let () =
  let m = Mat.zeros 5 5 in
  m.Mat.${[[2];[5]]} |> ignore;
  let open Mat in
  m.${[[2];[5]]} |> ignore;

produces the following diff:

@@ -2,6 +2,6 @@ open Owl
 
 let () =
   let m = Mat.zeros 5 5 in
-  m.Mat.${[[2];[5]]} |> ignore;
+  Mat.( .${} ) m [ [ 2 ]; [ 5 ] ] |> ignore;
   let open Mat in
-  m.${[[2];[5]]} |> ignore;
+  m.${[ [ 2 ]; [ 5 ] ]} |> ignore

• What are the selected options?

My .ocamlformat file is:

profile=janestreet
wrap-comments=false
let-binding-spacing=sparse

The option --print-config prints the configuration on the standard output, please put the result of this command in the report if you are not sure which option causes the issue.