Incorrect compile error when using String Interpolation

When you use string interpolation in conjunction with the ':=' method of parameter referencing it raises an incorrect compile error for example

Query &= vbCrLf & $"tt_flightno like {Cn(txtFlightNo.Text, IncludeOuterPercentages:=True)}"

Produces the squiggly line and error; "Cannot resolve symbol 'IncludeOuterPercentages'"

This is really annoying.