If I present "SFSafariViewController" when a "FamilyActivityPicker" is visible, it will automatically dismiss the "SFSafariViewController" and crash the "FamilyActivityPicker."
I'm assuming the cause of the bug is that each is in a separate process (aside from the app), and there's some hacks to try to stop "FamilyActivityPicker" from crashing, and this is causing the new bug because "SFSafariViewController" is also in a separate process.
(I'm not 100% if its just in 18.4 or iOS 18 overall...)
(I'll try to file a feedback soon, but its 100% reproducible for me across multiple devices on iOS 18.4)