I'm having a problem with a WordPress form. When clicking the next and previous button, the text via the wysiwyg disappears.
I was looking for a way to reproduce this and noticed that if you right click inside the wysiwyg area, it will show a 'reload frame' option in Chrome. This works best to test it your self in a 4.9.6 version where it's possible to right click without the tinymce 5 insert link option.
Test via: http://fiddle.tinymce.com/
After reloading the frame, this will make the form completely unusable. This is what happens on the WordPress form too.
I hope this is a bug that can be fixed!
Looking forward to your reply.