I don't think it's sandbox related because my app iClip has the same issue: If the app was launched from within /Applications, the Help isn't found ("The selected content is currently unavailable"), but once I move it into the App folder, even if I rename it, Help comes back.
Also, I build my app not with Xcode but with Xojo from 2021, and the Info.plist contains no Xcode or SDK related entries.
Topic:
Developer Tools & Services
SubTopic:
Xcode
Tags: