Smallcaps stopped working beginning with 6.12 in Illustrator for serif/sans

[Tyrhung]

Hi there!

I just noticed (after creating a figure with a Libertinus font after a while) that the small caps feature stopped working in Adobe Illustrator (25.2.1, if that matters) when using the Libertinus Serif or Libertinus Sans fonts beginning with 6.12:


(as you can see, only the i gets capitalized)

In versions prior to 6.12, small caps work as expected. Strange enough, even with >=6.12 small caps still work for Libertinus Serif Display and Libertinus Math (the latter seems to be a current workaround for Libertinus Serif):

From the changelog of 6.12 I would expect that

Building the fonts no longer use FontForge.

may be the issue here? I am not familiar with the font creation process but if you want me to try something out, I can do that :-)

PS: I really love this font!

[RGB-es]

No problem with Small Caps (+smcp) on Libertinus 7.040 when using XeTeX or LibreOffice. Maybe an Illustrator problem?

[Crissov]

Since small capital i soll seems to work, I’d assume some bug with the handling of the Turkish i.

[khaledhosny]

Duplicate of #434. Try using the so called World Ready Composer, it might work.

[khaledhosny]

I have read that Adobe’s default Composer does not support one to many substitutions, and Libertinus small caps features have some.

[Tyrhung]

Thanks for your help. Unfortunately, my Illustrator version does not have a World Ready Composer, so I cannot try whether this helps. However, as far as I understand, this is an Illustrator issue and not an issue of the font. The bug is reported to Adobe: https://illustrator.uservoice.com/forums/601447-illustrator-desktop-bugs/suggestions/44028336-small-caps-do-not-work-for-libertinus-font-open-t