Rename symbol does not work when applied on conversion operator return type

[just-ero]

Full issue information + repro project:
https://github.com/just-ero/roslyn-issues-repros/tree/main/4.14.0/001_RenameSymbol_ConversionOperator

Version

Roslyn: 4.14.0-1.25074.7

Steps to Reproduce

1. Add the following code wherever syntactically applicable:

   class C;
   
   class Repro1
   {
       public static explicit operator Repro1(C _)
       {
           return null;
       }
   }
   
   class Repro2<T>
   {
       public static explicit operator Repro2<T>(T _)
       {
           return null;
       }
   }

2. Apply the Rename symbol action on the return type in the conversion operator declarations.

Expected Behavior

The symbol is renamed everywhere.

Actual Behavior

Repro1: Only the name in the operator declaration is renamed.
Repro2: Nothing is renamed.

[just-ero]

Note: Renaming works correctly (even the return type of the operator is renamed) when applied anywhere else in the sample code.