Issue Summary

Any issue that will be filtered by an currentUser() clause as part of the Issue Source board/filter will not be shown on the plan.

This is reproducible on Data Center: YES

Steps to Reproduce

1. Create filter with JQL (plan Test 1)
   assignee = currentUser() AND resolution = Unresolved ORDER BY updated DESC
   
2. Create Plan with this filter as issue source
3. Create filter with JQL (plan Test 2)
   project in (ABC) AND statusCategory != Done
   
4. Add this filter to the Plan

Expected Results

Plan is showing issues from both queries / issue sources

Actual Results

Plan is only showing the issues from second issue source (plan Test 2)

Removing the second issue source from the plan will revert back and show issues from the first issue source (plan Test 1).

Workaround

In case this is for a plan for one specific user, you can name that user instead, as this will work.
Otherwise there is no known workaround for this behavior. A workaround will be added here when available