Multiline interpolation failing indentation check?

[Thorium]

Just a quick question, I'm not sure if this should be valid F# or no:

module test =
        let report = $"""# Summary

### Header

This is a table:
{[1;2;3] |> List.map (fun x -> sprintf "| %d |" x) |> String.concat "\n"}

The end."""
        printfn "%s" report

...as it fails for:

  {[1;2;3] |> List.map (fun x -> sprintf "| %d |" x) |> String.concat "\n"}
  --^

 error FS0058: Unexpected syntax or possible incorrect indentation: this token is offside of context started at position (95:9). Try indenting this further.
To continue using non-conforming indentation, pass the '--strict-indentation-' flag to the compiler, or set the language version to F# 7.