Missing glyph in Unicode code charts, Hangul Filler U+3164

[passcod]

Link to PDF file (or attach file here): http://www.unicode.org/charts/PDF/U3130.pdf

Configuration:

• Web browser and its version: Firefox Nightly: 55.0a1 (2017-05-12) (64-bit)
• Operating system and its version: Arch Linux: Linux kaydel-ko 4.10.13-1-ARCH xobj.dict is undefined #1 SMP PREEMPT Thu Apr 27 12:15:09 CEST 2017 x86_64 GNU/Linux
• PDF.js version: whatever is built-in to Firefox
• Is an extension: no

Steps to reproduce the problem:

1. Go to page 3, under Special characters, for U+3164

What is the expected behavior? (add screenshot)

Dotted square with initials HF. Rendered here with Google Drive PDF viewer in Android.

What went wrong? (add screenshot)

PDF.js shows just a blank space.

Issue found through this twitter thread: https://twitter.com/passcod/status/865366170169257985