Custom font errors - diacritic marks (Vietnamese) not showing up in the correct font
I've been testing the new custom fonts feature in Rise in anticipation of translating our content. (Our priorities are Vietnamese, Chinese, Thai, and Indonesian.)
Installing Open Sans as a Custom font, Vietnamese text is showing incorrectly in Rise. Many of the character are displaying in a smaller serif font rather than in our selected Custom font:
For comparison, using the same typeface in another program (Word), every character displays as it should:
I've tested with a number of typefaces, and the same characters always appear as the same smaller, serif font. This example is using the Google font Kanit:
Is there a reason why many of the characters used in non-English text are reverting to a standard serif font? This makes Rise practically unusable for translated text at this stage.
Are there any workarounds? Why is this problem ocurring?