Test video / fallback video of bear and seagulls playing in iOS default video player as well as in the google player in testmode

[therealPaulPlay]

Describe the bug
Sorry if this bug is a bit absurd, but a video of a bear (originates from Windows Vista, was used as a sample video for the .wmv codec back then) appears in the iOS default video player inside of the webview as an overlay. When you then show the loaded ad, the same video plays in the Google Video player.

When this bug occurs, the video simply pops up in the floating iOS video player from Safari Webkit. I assume this is either a fallback file if there was an error with the loaded video or that this is a test video that is falsely showing here. What is confusing me is why it is A) showing in the Safari video player and B) why it is showing if I'm not opting to show an ad anyway, it just pops up in some cases (rather rarely, around 0.2-.5%) after loading an ad.

This is the source of said video. I just hope that you guys have an idea where this video is from and why it is playing, if not, I'll try to get in touch with google and test whether this strange bug occurs without testmode as well.

To Reproduce
Steps to reproduce the behavior:

1. Integrate the plugin
2. Add all necessary id's and enable test mode
3. Load rewarded video ads without showing them
4. (Optional) When the bear video is showing, trigger the show ad event as fast as possible and when you are lucky the same video shows inside the Google Admob player

Expected behavior
The video of the bear with seagulls should not appear.

Screenshots

Environment
Using Construct 3 and Chadori's plugin from the ConstructMasterCollection.

Additional context