“Also, when both ACF PRO and Gutenberg 6.4 are active, my ACF Block with a wysiwyg field in it does not seem to initialize the tinymce editor easily when I click into it.”
Besides the warning message I showed in my screencast, I also get the tinymce initialization issue, BUT only when going from preview to edit mode. Clicking the “Visual” or “Text” tabs forces TinyMCE to wake up and come to life !