can it be that the editing of elements in html5 mode is not fully supported?
While changing element styles in cms / shop mode works largely without any problems, in html5 mode this sometimes does not work or only partially.
For example with tables: Here I can change the background color in elements, but this only becomes visible when the page is rendered, not in the wysiwyg editor. However, if I change lines or spaces, this will not be accepted.
Which element changes should work in html5 mode and which shouldn't?