Indic Font Ligature Rendering

[ng4mf]

Description

Ligatures don't seem to render properly for some scripts. I have specifically tested with Devanagari, an Indic script, though the problem may also exist for other scripts that heavily use ligatures. I've tested on Lubuntu 17.04, Lubuntu 18.04 and Windows 10.

Steps to Reproduce

In the Wikipedia search bar, type क + ् + र (0x915 + 0x94D + 0x930)

Actual result:

Expected result:
Screenshot from Palemoon:

Reproduces how often:

Always

Brave Version

about:brave info:

Brave 0.23.18

Reproducible on current live release:

Release from June 26, 2018 has the rendering issue.