Wrong form of U+103F MYANMAR LETTER GREAT SA in Mon

[dscorbett]

Font

NotoSerifMyanmar-Regular.ttf

Where the font came from, and when

Site: https://github.com/googlefonts/noto-fonts/blob/34e98229863e627d0f841e124a8657d5d0348b04/phaseIII_only/unhinted/ttf/NotoSerifMyanmar/NotoSerifMyanmar-Regular.ttf
Date: 2019-06-09

Font version

Version 2.001

Issue

In Mon (language system tag 'MON '), U+103F MYANMAR LETTER GREAT SA is rendered like <U+101E MYANMAR LETTER SA, U+1039 MYANMAR SIGN VIRAMA, U+101E MYANMAR LETTER SA>. Unicode considers these distinct sequences: one should not be rendered as the other. Noto Sans Myanmar gets it right.

Character data

ဿ
U+103F MYANMAR LETTER GREAT SA

Screenshot

[ohbendy]

I'm looking at version 2.001 and can't reproduce this error. Like you say, သ္သ (101E 1039 101E) should always be stacked, ဿ (103F) should never be stacked. Here's what I see in Wakamai Fondue for these two distinct sequences:

[simoncozens]

Yes, agreed, we're definitely seeing great_sa for this.

[dscorbett]

I can still reproduce this in Noto Serif Myanmar version 2.106. It only happens when the language system is Mon.