The {{wikimacroparameter/}} macro is not working well when there's text around it

Steps to reproduce :

• Import the provided XAR
• Navigate to Test.WebHome
• Edit the page using WYSIWYG editor

Expected :

• The wikimacroparameter/ macro is embedded inline into the testMacro, the parameter should be rendered inline with the text "This is a macro, you can edit a parameter here :"
• The parameter should be editable

Actual :

• The parameter is not editable
• The parameter is displayed as a block