I can confirm that this issue persists for me as well after updating to version 6.7.1.
Notably, this problem does not occur when using Yoast Premium; it is specific to websites running the free version of Yoast.
To assist with debugging, here’s the error message encountered:
Uncaught TypeError: (0 , n.render) is not a function
at classic-editor.js?ver=XYZ
at window.yoast.initEditorIntegration (classic-editor.js?ver=XYZ)
at HTMLDocument. (post-edit.js?ver=XYZ)
