No string highlighting with \n

I have this code:
```
func f() {
var s = "abc \n"
}
```
The problem is that `"abc \n"` is black (should be green because it is string). Problem appears if I use special symbols like `\n`.
When I set cursor before this string and then type backspace and space string is highlighted correctly.
However the parsing seems to be correctly in both cases.
Any ideas why this may happen?

The issue names no source files, tests, or entry points. Reproduce the highlighting problem in the sample JetBrains plugin with a string containing \n, then trace the syntax-highlighting path and compare it with the correctly parsed string; done means the string is highlighted consistently without requiring an edit.

Written by the indexing model from the issue text.