As far as I am aware, acf gb blocks will only work right now in the 5.8 Beta, and everything may not work. I don’t know the eta of the 5.8 release (I am not a dev on ACF) except that they are working on issues related to gb. I believe that are many other issues that they are working on as well, so 5.7.9 may not address many other issues. You can see some of the issues ACF is having here https://github.com/WordPress/gutenberg/issues/12692. For more information than this you’d probably need to contact ACF support https://www.advancedcustomfields.com/contact/
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