Hello, there are 2 issues for Hangul.
Hangul composition plugin is not working in the newest version. It is still working at Glyphs 2.4.4.
I’d like to use an anchor for hangul composition plugin when a component is the same but different position. So, I made some anchors. But anchors do not work when the glyph has Hangul Unicode. I tried again with a user-defined glyph, then, it worked.
I’ve also sent an email with my glyph file, please check it if you need to see the file.