O3EAADUserInUnifiedGroup - Fake Outstanding

Hi,

in OneIdentity version 8.2.1 I've installed the Exch Online connector in order to manage unified group memberships.
I've synchronized some UnifiedGroups with the membership as well, but I noticed that, when I start the recon again, some memberships are flagged as outstanding despite the user is present whitin the membership of the group in the target (I saw in SynchEditor->TargetSystem->Browse).
I've checked about filters but there aren't.
Do you know a possible reason of this behavior?
Thanks,

Roberto