Solvedflutter App Store iOS submission fails: The bundle Runner.app/Frameworks/App.framework does not support the minimum OS Version specified in the Info.plist

I just upgraded Flutter and Xcode and now my successful built are failing when I am uploading it to the App Store connect. The error is:
ERROR ITMS-90208: "Invalid Bundle. The bundle Runner.app/Frameworks/App.framework does not support the minimum OS Version specified in the Info.plist."

Before the upgrade, it was working fine. I checked the Minimum OS versions in Xcode and both are set to iOS 13.0 (i.e info.plist, iOS Deployment Target).

Is there a bug in one of the upgraded tool (Flutter or Xcode)?

[✓] Flutter (Channel master, 1.19.0-2.0.pre.173, on Mac OS X 10.15.5 19F96, locale en-US)

[✓] Android toolchain - develop for Android devices (Android SDK version 29.0.3)
[✓] Xcode - develop for iOS and macOS (Xcode 11.5)
[✓] Android Studio (version 3.6)
[✓] VS Code (version 1.45.1)
[✓] Connected device (2 available)

• No issues found!

After doing a flutter clean, changing MinimumOSVersion (inside /ios/Flutter/AppframeworkInfo.plist) to 9.0, iOS Deployment Target (inside project runner) to 9.0 and iOS Deployment Target (inside target runner) to 9.0 the error disappeared.

After doing a flutter clean, changing MinimumOSVersion (inside /ios/Flutter/AppframeworkInfo.plist) to 9.0, iOS Deployment Target (inside project runner) to 9.0 and iOS Deployment Target (inside target runner) to 9.0 the error disappeared.

Time saver!

It eventually worked after changing the App.framework/info.plist value to 13.0, but unbeknown to me, something had changed it back to 8.0. So I checked it again for the 6th time and changed it to 13.0, then the error went away.

/ios/Flutter/App.framework/info.plist
MinimumOSVersion
13.0

/iOS/Runner/
MinimumOSVersion
13.0

Might be good to reopen this, as using flutter upgrade caused this to happen today as well.

After doing a flutter clean, changing MinimumOSVersion (inside /ios/Flutter/AppframeworkInfo.plist) to 9.0, iOS Deployment Target (inside project runner) to 9.0 and iOS Deployment Target (inside target runner) to 9.0 the error disappeared.

Tried these exact steps on 1.21.0-9.1.pre and didn't work - when I built iOS --release the AppframeworkInfo.plist got reset to 8.0 at some point and uploading to ASC gives the error still.

Edit: I made a mistake actually in the steps - I tried to change /ios/Flutter/App.framework/Info.plist, not ios/Flutter/AppframeworkInfo.plist.

The plist I changed gets reset to 8.0 during build because it apparently gets its MinimumOSVersion from the other plist you are supposed to change. After following the instructions properly I was able to get a release build to TF.