Describe the bug

Crash within the cover block when trying to scroll the color palette on the cover placeholder.

To Reproduce
Steps to reproduce the behavior:

1. Open a post
2. Add Cover block
3. Try to scroll the color palette on the placeholder
4. Observe the crash
   Expected behavior
   A clear and concise description of what you expected to happen.

Screenshots
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Smartphone (please complete the following information):

• Device: [e.g. iPhone6, Pixel 4]
• OS: [e.g. iOS 8.1, Android X]
• Version [e.g. 22]

Additional context
Add any other context about the problem here.