Custom CSS “content” tag not working

Hi, I discovered an issue when using the content tag in the custom css tab in the block editor.
This code:

.selector:after {
content: "+49"; }

changes to:

.selector:after {
content: \"+49\"; }

after saving and reloading the page in the block editor. This obviously results in the content not being displayed. When I use other plugins for custom css, this problem does not occur.

I used the exact same code when I built my site about 1 year ago. It worked fine at that time.

I’ve found a solution to fix the problem for now, so I don’t really need any help with this. I just wanted to report this issue so you could possibly fix it in future updates.

Cheers, Joscha