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[iOS] Input.GetKey is delayed returning to False on key release on iOS build



Reproduction steps:
1. Open project in ""
2. Build for iOS and open the project in Xcode
3. Connect a Keyboard to an iOS device
4. Deploy to an iOS device
5. Press and release a key on the keyboard while inspecting the debug UI in the application

Expected result: Input.anyKey will become true and stay so until you release the key
Actual result: Input.anyKey will become true and will stay true for a while after releasing the key

Reproducible with: 2019.4.27f1, 2020.3.9f1, 2021.1.8f1, 2021.2.0a17
Could not test with 2018.4.35f1 (project breaks)

Reproducible with:
iPhone 12 (iOS 14.1)
Not reproducible with:
OnePlus A5000, Android 10, Adreno 540, Snapdragon 835

Not reproducible with standalone or editor
Reproducible with M1 Catalyst build

  1. Resolution Note (2022.1.X):

    Unity does not support external mouse or keyboard input on iOS and iPadOS at the moment, this extends to iOS apps running on Apple Silicon Macs. To handle external mouse or keyboard input on Apple Silicon Macs please build your project as Standalone with "Architecture" set to "Intel 64-bit + Apple silicon".

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