CF7 breaks ACF PRO WYSIWYG in widget block

This is a very specific use case.

To duplicate

• Create a BLOCK element using ACF Pro
• Create ACF Repeater assigned to this block, in the repeater have a WYSIWYG editor (my case it is in a repeater, have not tested outside of the repeater)
• In the Widget area, add this new ACF block

You will see that you cannot switch between Visual / Code editor and the text may start off as white on white background

The following error shows in console

wp-tinymce.js?ver=49110-20201110:3 Uncaught TypeError: Cannot read properties of undefined (reading 'onpageload')
at wp-tinymce.js?ver=49110-20201110:3:354147
at e (wp-tinymce.js?ver=49110-20201110:3:354205)
at Se.y.bind (wp-tinymce.js?ver=49110-20201110:3:11640)
at Object.M as bind
at Object.init (wp-tinymce.js?ver=49110-20201110:3:355591)
at n (editor.min.js?ver=6.2:2:1864)
at HTMLDocument. (editor.min.js?ver=6.2:2:248)
at C (wp-tinymce.js?ver=49110-20201110:3:10800)
at HTMLDocument.d (wp-tinymce.js?ver=49110-20201110:3:10946)
(anonymous) @ wp-tinymce.js?ver=49110-20201110:3
e @ wp-tinymce.js?ver=49110-20201110:3
Se.y.bind @ wp-tinymce.js?ver=49110-20201110:3
M @ wp-tinymce.js?ver=49110-20201110:3
init @ wp-tinymce.js?ver=49110-20201110:3
n @ editor.min.js?ver=6.2:2
(anonymous) @ editor.min.js?ver=6.2:2
C @ wp-tinymce.js?ver=49110-20201110:3
d @ wp-tinymce.js?ver=49110-20201110:3

Note: the block works fine on pages/posts, just breaks in widgets

Disabling CF7 does fix the error and the widget will work fine