Ligatures and copy/paste
Unfortunately, if you activate the ligatures in a text field and copy this text into another text field, the ligatures are deactivated. Some special formatting of the letters is lost in the process.
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Douglas Waterfall commented
I happened across the bit of code responsible for that and wondered what it was doing. My guess is that the code pre-dated when ligatures were first enabled in AE and missed getting removed/updated.
Thank you for reporting this, I just filed a bug (team: DVAAE-4223987).
After Effects Engineering