In the Tracker reports,
given a list field 'assigned_to' bound to a dynamic user group (like project members)
and given I had set the 'assigned_to' value to 'edobransky' for an artifact
and given that the user 'edobransky' is suspended
when I search "assigned_to = 'edobransky'" using TQL (expert mode)
Then I get the error
> The value 'edobransky' doesn't exist for the list field 'assigned_to'.

But I can see the 'edobransky' in the report when I enter no query, so I expect to be able to search using this value.
This only happens for dynamic ugroups, if the list if bound to a static (user-created) ugroup, suspended people are returned as well.
When I search in normal mode (not expert mode), 'edobransky' is not selectable (it's not in the criterion selectbox).

This means that if I assign artifacts to a project member and then suspend them, I will never be able to search for artifacts that were assigned to them.