The hinting not applied when export to JPG with anti-aliasing set to Hint in "Export for screen"
When exporting a JPG using "Export for screen", the hint information applied in the anti-aliasing setting is not applied and the expected output cannot be obtained.
environment / OSX10.13.6/Illustrator ver.24.0.0
Step to reproduce.
1. Files -> Export -> Export for screen
2. Set the Format as "JPG 100" and click the Preferences icon.
3. Choose "JPG100" and set the Antialias as "Hint".
4. Click apply and export.
Result : The Hint no applied.
We need to get correct images like Illustrator ver.23.
Workaround
Use another functionality such as "Save for Web" or use Illustrator ver.23.

Disabling 'Export in Background' in Preferences > File Handling helps to workaround the problem (until the actual fix). Make sure you enable 'Art Optimized (Supersampling)' as an anti-aliasing option in Export for Screens settings as well.
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Chris Schmidt commented
I have same issue with Adobe Illustrator 2020 24.0.1
Windows 10 x64It only happens when I try to export as JPG 100, but does not happen with PNG