Using the attachments macro in a user macro breaks the page

Steps to reproduce :

1. Create a simple User macro. Refer to attachment for settings
2. Create a page and insert User macro
3. No insert Attachment macro inside user macro
4. Save the page
5. Notice that the part of page after Attachment macro is lost. Also, all the links and buttons from Confluence are also lost
6. Edit the attachment macro again and uncheck the "Allow upload" checkbox
7. Save the page.
8. Notice that the problem disappears.