This is working again without any changes to the project build settings or build output (App Store Connect was invalidating these binaries earlier).

Started seeing this same issue with "libswiftAVFoundation.dylib" this week: Created archive in Xcode, no custom post build scripts. Uploaded two builds using Xcode 12.4 (12D4e) via Organizer. Both builds were invalidated on TestFlight once submitted for public beta review. Tried cleaning build folder. Haven't made any changes to any build settings recently. I don't have "AVFoundation" framework or "libswiftAVFoundation.tbd" embedded (in Project General), going to try doing that and see what happens, but it's always worked without in the past. Build Settings: Swift Language Version: Swift 5 Always Embed Swift Standard Libraries: YES

Started seeing this same issue with "libswiftAVFoundation.dylib" this week: Created archive in Xcode, no custom post build scripts. Uploaded two builds using Xcode 12.4 (12D4e) via Organizer. Both builds were invalidated on TestFlight once submitted for public beta review. Tried cleaning build folder. Haven't made any changes to any build settings recently. I don't have "AVFoundation" framework or "libswiftAVFoundation.tbd" embedded (in Project General), going to try doing that and see what happens, but it's always worked without in the past. Build Settings: Swift Language Version: Swift 5 Always Embed Swift Standard Libraries: YES