Unable to save Page properties report

Summary

Unable to save Page properties report if we mention more than one user in mentioning user filter.

Step to replicate

1. Create a test page then add a page property macro and label the page 
2. Save the page created in step 1.
3. Create another page then add page properties report macro 
4. Click add filter and add Mentioning user filter
5. After adding the mentioning user filter, please add 2 user in that field.
6. Save the macro then save the page
7. After that click edit page and click edit on the page properties report macro.

Observed behaviour

Expected behaviour

The mentioning user filter show the mention user and able to save the macro.

Workaround

Only mention one user under the mentioning user filter.