New blog post "Undocumented Catalina file access change":
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It makes sense as proper apps should not show 'wants to access X' dialogs.
It works on filesystem level, not TCC level, has different attribution/responsibility mechanisms.
Access is given to the app after using open dialog or bookmark is shared (via drag&drop or other means)
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Indeed, this was documented in the Advances in macOS Security session at WWDC. To prevent spurious dialogs when a file access is *clearly* due to a user action (like dragon drop/manual file opens, double-click in the finder) access is inferred by the user’s action and granted.
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So it is really not documented properly at all. Sigh. This really develops into a nightmare, Apple.
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What’s worse that there is no way to reset this stuff. That turns into testing hell as well.
As for development, all hope was lost when they irreversibly reverted / broken access check APIs they promised on WWDC session.