Multiple YouTube Player Widgets - 'An error occurred'

When I view a page with more than YouTube Player widget in either preview or test mode, only one of the videos will play on-click. The remaining videos display a grey background with 'An error occurred. Please try again later.' The strange thing is that the video which plays on-click changes each time.

Has anyone else experienced this? Is this a bug with preview/test mode or a reflection of how the app will perform once published?

Thank you

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