Affinity Suite ligatures not displaying.

[cooltrooper]

I'm intending to use the font as it seems very suitable for documentation, but non of the code ligatures seem to work.
Other fonts like Jetbrains Mono or fira code ligatures work as expected. All is fine in VSCode.

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• Your font version: (Release or git, version) 5.04
• Your font variant: all
• Your operating system (name and version): OSX
• Your application using Iosevka: Affinity Deisgner/Publisher

[cooltrooper]

I removed all fonts and just installed the ttf for Iosvka Regular and the proplem persists.

[be5invis]

@cooltrooper Are all ligations broken, or only a certain subset of ligations are broken?

[be5invis]

@cooltrooper And how do other Apple applications behave?

[cooltrooper]

Works fine in notes, text edit and fontbook, but not word.
Here is a selection of ligatures from Designer:

[be5invis]

So this should be a problem with Affinity software since Iosevka works properly in many other places. I suspect Affinity incorrectly implemented text shaping on certain platforms, which caused this issue.
(Word is another story: it disables OT features by default and you have to manually enable it.)
Closing as external.

[cooltrooper]

I've started a thread on their support forums, for reference:
https://forum.affinity.serif.com/index.php?/topic/136875-iosevka-issues/