Board Thread:Support Requests - Getting Technical/@comment-4193424-20200915070024/@comment-9605025-20200917161541

It isn't a bug, that is just how it works. When using the portable infobox markup, only parameters specified using the "source" attribute are recognized by VisualEditor. Also, the label tag expects plain text. You might be able to get it's appearance to work out with more complex things but, as you can see, it also messes with the field names in VisualEditor.