can't edit object of type XWiki.WikiMacroParameterClass > 0

I'm trying to edit some parameters of the video macro. (Should be described in german.)

If I try to edit macro parameter "width" (1) I will always end up editing parameter "url" (0).

• go to /xwiki/bin/edit/Macros/Video20?editor=object
• click on "WikiMacroParameterClass 1: width"

• see parameter name "url" instead "width"

Trying it with every parameter higher then object=0 will end up in parameter name "url" and it's further keys.