The first call to act_user_manager_list_users() may lazily load
and notify the 'is-loaded' property, in which case we end up
indirectly recursing into reload_users(). Because we recurse
*after* purging carousel items, the same user is added twice:
once in the leaf recursion call, and once again in the call that
notified the 'is-loaded' property.
A simple workaround to this is purging carousel items after the
call to act_user_manager_list_users().
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