Steps to reproduce

1. Create a new page
2. Add the WhatsApp Button block
3. Click on the List View and select the WhatsApp Button block

What I expected

That the block icon would turn white when selected, as the others do.

What happened instead

It's a black square when selected, you can't see the icon.

Browser / OS version

Chrome 87.0.4280.88
OS X 10.15.7

Screenshot / Video

This is the normal behavior you see on other blocks, black background with a white icon:

And this is what happens with the WhatsApp Button block:

Context / Source

#dogfooding