Using an ACF block registered through PHP. Even if the content is cleanly created and saved correctly, the editor (browser) warns me when I want to leave the page, that there are unsaved changes.
I am having this issue too. It seems to only affect me when I’m using an ACF php block and have the latest Gutenberg editor plugin installed. It does not do this with stock gutenberg (meaning no plugin).
I thought that too, but after reports from a client, it might also be connected with the Gutenberg plugin at version 6.3.0 or 6.4.0. I’ve registered an issue here too, in case that’s the problem. https://github.com/WordPress/gutenberg/issues/17395
Mark, a heads up. I found this on GitHub as well for ACF. https://github.com/AdvancedCustomFields/acf/issues/218
The guy’s screencast is what I’m experiencing.
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.
“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 !