After a recent Windows 10 update, emoji became invisible in several apps (Google Chrome, MS Word).
The behavior of MS Word is particularly weird: When I open a DOCX file that contains emoji (set with the font Segoe UI Emoji), they are invisble. After I save it as PDF, emoji become visible also in the DOCX file. But if I then save the DOCX file, close it, and open it again, the emoji are invisible again.
I compared the font seguiemj.ttf to a backup of that file that I happen to have from when emoji were visible. The files are identical, i.e. the font hasn't changed.
Deleting the FontCache folder didn't help.
What should I try to fix this?