How to reproduce
- create a group
- add a user both as coach and participant to the group
- enable the group member tool
- open group member tool
=> user is only displayed as coach and hidden from the participant listing
This behavior was introduced by the recent refactoring when we streamlined the UI to match the course participant list styling. In the course, the user lists are deduplicated so that authors can put themselves as participant to the course for test purpose. In the context of the group this behavior is not desired.
If a user has both group roles he should appear in both lists.