Yes, that is the issue I’m seeing. Glad to know a fix is on the way.
I just observed this same issue on our main website which relies heavily on Gutenberg. Definitely ignores ACF post type rules when Gutenberg is activated. If I keep Gutenberg activated but also activate Classic Editor, problem goes away (but I don’t get all the editor goodness of Gutenberg).
This just happened for me as well. Downgrading now.