Default text size and color on Notice and Accordion blocks

Hey! I really love Atomic blocks plugin, specially its simplicity and ease of use. I’ve been using it in 4 different websites with excellent results but now I’ve been having this problem all the time:

Whenever I delete the value in the “Font Size” field in either Notice or Accordion block or when I click “Clear” under the “Text Color” option, it uses the default values from my theme’s paragraph size and color -which is exactly what I want!

BUT when I publish the page and go back to edit, it either says “This block contains unexpected or invalid content” or it goes back to size 18 and black color. Which becomes a huge pain every time I need to update anything.

I’d love if the Notice and Accordion blocks would use the theme’s size and color by default with the option to change it. But if that’s not an option would it be possible to at least have the option to use the theme’s values? Is it supposed to work like that already but there’s a problem somewhere?

Thanks in advance!
Marc