Failure on using user defined macros in flow text

It seems to be a problem on using user defined macros in flow text.

Use Case:

• Open a site for editing
• Embed a user defined macro in flow text
• Save the site
• Open the site for editing again.

Failure: The flow text is broken at the place of macro: before and after the macro two linebreakes are inserted.

For macrodefinition see screenshot. It defines a simple link to a jira ticket for using in flowtext.

This bug makes this sort of user defined macros unusable.