Ambiguous behavior after node demotion

Case 1:
"selected primary for instance 2" are different for different nodes after demotion of primary node

Steps to Reproduce:
1. Setup the pool of 7 nodes.
2. Demote primary node (node 2 in this case).
=> View change happened on the rest nodes. "selected primary Node5 for instance 1" and "selected primary Node5 for instance 2" on all of them. (like in INDY-1112)
3. Promote demoted node back.

Actual Result:
On Node2 "selected primary Node6 for instance 2". It differs from the rest nodes.

Expected Results:
Selected primary for instance 2 should be the same on all of nodes.

Case 2:
After demote and promote primary (node2) node1 has stopped to writing NYMs. Logs are attached.
Steps to Reproduce:
The same as in previous case, but selected primaries are different: