Editing same page at same time breakes nested macros as "Broken Macro"

Summary

Editing same page at same time breakes nested macros as "Broken Macro"

Environment

• Confluence 5.10.1

Steps to Reproduce

1. Place a Info macro on a page.
2. Place a Status macro into the Info macro.
3. Save the page
4. Open the page with one browser(A)
5. Open the page with another browser(B)
6. on (A) Edit the page and add a line (ex. line1) into the first line.
7. on (B) Edit the page and add a line (ex. last_line) into the last line.
8. Save the page on (A)
9. Save the page on (B)
10. You can see the "Broken Macro"

Expected Results

Save safety without a problem.

Actual Results

nested macros are broken, when user edit one page at same time.

...
 <ac:structured-macro ac:name="info" ac:schema-version="1" ac:macro-id="82bfd187-5659-4a16-bf0a-d97205229590">
 <ac:rich-text-body>
 <p>
 <ac:structured-macro ac:name="status" ac:schema-version="1" ac:macro-id="9e060ee3-66dd-4fda-bf4d-360b92d40da2">
 <ac:parameter ac:name="colour">Red</ac:parameter>
 <ac:parameter ac:name="title">test</ac:parameter>
 </ac:structured-macro>
 ...

...
 <ac:structured-macro ac:name="info" ac:schema-version="1" ac:macro-id="82bfd187-5659-4a16-bf0a-d97205229590">
 <ac:rich-text-body>
 <p>
 <ac:structured-macro>
 <ac:parameter ac:name="colour">Red</ac:parameter>
 <ac:parameter ac:name="title">test</ac:parameter>
 </ac:structured-macro>
 ...

ac:name, ac:schema-version and ac:macro elements have gone.
missing ac:name causes this issue.

Workaround

if you installed Source Code Editor plugin, you edit the source code.
and add

 ac:name="status"

after ac:structured-macro and save.
this is a case of using Status Macro.