VisualEditor editor is full of bugs. Since his implementation i have disabled it for me, because, as experimented user i just like to edit clean code.
So, i noticed folowing bugs
when you edit a part of a wikilink (termination) visual editor leaves old wikilink as adrress and only add new edited variant as label. For example if you want to correct digit of an wikilinked year - your action will just add a correct label but wikilink will be the same, old.
I first noticed this on rowiki when anonymous users edited wikipedia. One fresh example can be this https://ro.wikipedia.org/w/index.php?title=Gustar_%28festival%29&diff=8812463&oldid=8805982
Now i tested myself this "phenomenon" on test2wiki and i obtained the same result
https://test2.wikipedia.org/w/index.php?title=Edit_page_for_firefox&diff=104063&oldid=104062
Other bug: when you try to remove title of a section from a page (for merging 2 sections), visual editor removes only caption but it keeps the real section heading (====) and adds between equal sign an "<nowiki/>". The result will be ==<nowiki/>== and section will exist further without title. Test edit: https://test2.wikipedia.org/w/index.php?title=New_page_for_bugzilla&diff=104066&oldid=104065
Also there exists some problems when copying of tables in a page edited via VisualEditor. VisualEditor adds again some <nowiki> </nowiki> tags, and in some cases adds magic words like INDEX and NEWSECTIONLINK
Example (real edit on rowiki): https://ro.wikipedia.org/w/index.php?title=Kiesza&diff=next&oldid=8808818
Version: unspecified
Severity: major