Bogus glyphs for halfwidth characters

[Mark Davis ☕️]

For halfwidth characters like U+FF70 HALFWIDTH KATAKANA-HIRAGANA PROLONGED
SOUND MARK I'm getting bogus glyphs from Kaiti* and Songti* (and STKaiti,
STSongti).
​ See screenshot below.

​Anyone else see that, or know what is happening? Unfortunately, these
fonts are getting picked up first in the fallback chain​ for my browser, so
they are pretty apparent!

[image: Inline image 1]

Mark <https://google.com/+MarkDavis>
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