Description of problem:

Certain queries to the /rest/query/task (synonym for the /rest/task/query operation) return a list of TaskSummary instances that contain duplicate TaskSummary's.

How reproducible:

Always

Steps to Reproduce:
1. Do the above REST operation, in particular with criteria that do not involve the user (process instance id, for example) on a task that references other users or groups besides the user doing the REST operation.
2. Examine the results.

Actual results:

Duplicate task summaries.

Expected results:

Unique task summaries per task id.

Additional info: