Users Group Membership not affected in Groups Members overview

Getting advice
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1

I have configured a User Federation with LDAP.
Then i have configured a “hardcoded_ldap_group_mapper” with a existing Group.
When I check Group Membership of an ldap synchronized user, the mapped Group is shown in Membership.
But when I check the Members of this Group, no users are shown in the list.
What´s wrong here?
We use Keycloak v18.0.2