Deleting a wiki macro document can unregister the current component even if it's not the macro itself anymore

Steps to reproduce:

• Create a 'hello' macro as defined at https://www.xwiki.org/xwiki/bin/view/Documentation/DevGuide/Tutorials/WritingMacros/WikiMacroTutorial/ e.g. in a page 'Main.HelloWorldMacro'
• Rename this page into 'Main.HelloMacro'

Actual result: the pages including the 'hello' macro display "Unknown macro: hello."

Expected result: the macro is executed just as it was before the rename.

NB: if the new page is manually saved after the rename, then the macro works as expected again.