Editable macro parameter gets input not meant for it

Please find attached a small test case used with XWiki 18.1.0. The content of the page is
 

Text

{{grid title="A meaningful title"}}
|=A|=B|
|a|b
{{/grid}}

The macro grid is defined on the same page. The parameter title is editable.

If you open the page with the XYSIWYG editor, place the curser behind “Text”, press enter and switch to source mode you’ll see

Text

{{grid title="

 
A meaningful title"}}
|=A|=B|
|a|b
{{/grid}}