KV+XDCR System Test : Rebalance after failover stuck, nodes go to pending state

Build
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3.0.0-819(xdcr on upr, internal replication on upr)

Clusters
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Source : http://172.23.105.44:8091/
Destination : http://172.23.105.54:8091/
The clusters are available to investigate.

Steps
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1. Load on both clusters till vb_active_resident_items_ratio < 30.
2. Access phase with 98% gets, 2%sets runs for 3 hours
3. Rebalance-out 1 node at cluster1 with workload [high dgm ~4%]
4. Rebalance-in the same node with workload
5. Failover one node with workload. Rebalance to remove the node ==> rebalance stuck, 4 nodes go to pending state.

Attached
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Cbcollect info for source cluster. 172.23.105.52 was failed over and was getting rebalanced out.
Rebalance did not progress despite pausing xdcr. Let me know if you need logs from remote cluster.