Hangul with underscore returns invalid status (returns dots)

**Describe the bug**

When I use Hangul with underscore, or other characters (like `+`, `-`, ...etc ), whole strings seem dot chraracters.
It's working when I make documents in english with those characters.

**To Reproduce**
for example,

```

한글_+english

```

_In react-pdf.org/repl, hangul texts not working at all._

**Expected behavior**

All String characters should seem correctly.

I'm not sure the reason of falling invalid state, I think mapping/substituting gylph or features (selecting scripts) is the one.

**Screenshots**
If applicable, add screenshots to help explain your problem.

without special characters, working well.

**Desktop (please complete the following information):**
- OS: [Any OS: MacOS, Windows]
- Browser [Any Browser : Safari, Chrome, Firefox]
- React-pdf version [v2.0.21]