Gutenberg’s block additional class name and WordPress updates

Hello everyone.

I’m attempting to customize Gutenberg column blocks on my front page.
I’ve added a custom class name to a column block using the blocks Additional CSS class feature.
In my child theme style sheet, I’ve added my custom css declarations to the block element that has the custom class I created. And this works fine.

My question is if a New WordPress update is issued will the update remove all my Gutenberg additional classes?

Thanks in advance for any help with this question.