Rebalance from 3 to 4 nodes [with views] fails due to "{unexpected_exit, ..., {bulk_set_vbucket_state_failed..."

Rebalance-in, 3 -> 4, 1 bucket x 100M x 2KB, DGM, 1 x 1 views, 10K mixed ops/sec, 400 queries/sec

It actually reaches ~99% but fails at the end.

"Rebalance exited with reason {unexpected_exit, {'EXIT',<0.15520.168>, {bulk_set_vbucket_state_failed, [{'ns_1@172.23.100.32', {'EXIT', {{{noproc, {gen_server,call, ['upr_replicator-bucket-1-ns_1@172.23.100.30',

{setup_replication, [86,87,88,89,90,91,92,93,94,95,96,97, 98,99,100,101,102,103,104,105,106, 107,108,109,110,111,112,113,114,115, 116,117,118,119,120,121,122,123,124, 125,126,127,128,129,130,131,132,133, 134,135,136,137,138,139,140,141,142, 143,144,145,146,147,148,149,150,151, 152,153,154,155,156,157,158,159,160, 161,162,163,164,165,166,167,168,169, 170]}

, infinity]}}, {gen_server,call, ['replication_manager-bucket-1',

{change_vbucket_replication,256, 'ns_1@172.23.100.29'}

, infinity]}}, {gen_server,call, [

{'janitor_agent-bucket-1', 'ns_1@172.23.100.32'}

, {if_rebalance,<0.14989.17>, {update_vbucket_state,256,replica, undefined,'ns_1@172.23.100.29'}}, infinity]}}}}]}}} ",