I’m experiencing exactly the same bug on several WordPress sites. When updating from version 6.6.2 to 6.7, on Firefox, the ACF (PRO) WYSIWYG fields randomly (or at least I haven’t identified the exact trigger) display no content in visual mode. In text mode, the content is there, but when switching back to visual mode, it disappears, and the well-known JS console error appears.
I’ve updated both WordPress and ACF PRO, but the issue is still present.
