Following WFLY-13627, a non-tx invalidation cache will schedule session/SFSB expiration on the local member.  When that member leaves, the expiration will be reschedule on the primary owner of segment 0 (in a non-tx cache, all entries map to segment 0).  However, since that member cannot distinguish which sessions/SFSBs were owned by the leaving member, it must schedule all sessions/SFSBs.