How to reproduce:
1. Open the attached project
2. Build project for iOS
3. Open Xcode project and deploy it to an iOS device
4. Click the 'Inhaler Scan' button in the menu
5. Open the attached 'Symbicort Logo Printable.pdf' file
6. Use the attached marker pdf (on screen) to scan it using the app
7. Notice that three button appeared when the marker is scanned
8. Click 'Video' button
9. Click 'Exit' button
10. Click 'Video' button

Expected result: 'Video Guide' window is opened when 'Video' button is clicked
Actual result: Nothing happens when 'Video' button is clicked

Reproducible with: 4.0.9(2019.4.17f1, 2020.1.17f1, 2020.2.0f1, 2021.1.0a10)
Not reproducible with: 4.1.1(2019.4.17f1, 2020.1.17f1, 2020.2.0f1, 2021.1.0a10)
Can not test with: 2018.4.30f1 because package and canvas errors

Reproducible with:
iPad 6th gen (iOS 14.2)

Notes:
- Video of reproduction is attached in Edit
- If the issue is not reproducible from the first time please repeat 8 and 9 steps until 'Video' button becomes unresponsive