Two side widget component background color does not save changes

I can’t save changes to the background color of a two-sided widget component.

@Mind-Brain advised me to open a new thread for this.

Yesterday I made a couple of videos to show the problem.

You can see them in the following link to the post:

We are not sure if this is a bug or if it needs to be configured in a special way for it to work.

If you know how to fix this, please let me know.

Thank you so much!!