C# syntax highlighting broken with collection expressions and string interpolation in method calls

[alexr00]

Type: Bug

Description: the syntax highlighter incorrectly colors string interpolation when using collection expressions like string[] array = [...] followed by method calls with interpolated strings

Info(
  $"Hello: '{thing}'",
  $"Foo: {string.Join(", ", fooz)}",
  $"Bar: {string.Join(", ", barz)}"
);

---

the second comma ", ", betweens the params are orange
orange | orange

im used to em like this
orange | white

---

this is expected color of the comma thats a string and the comma that separates the parameters are different

string.Join(", ", fooz)

this is what getting both commas are the same color

$"Foo: {string.Join(", ", fooz)}",

---

so basically this is expected
blue | white

this is what im getting
blue | blue

Originally from @ezexe in microsoft/vscode#255178