Unable to recover write consensus at n-f after f+1 descent

Build Info:
indy-node 1.3.51

Steps to Reproduce:
1. Install pool of 6 nodes and send NYM to make sure that pool works.
2. Stop 6th node >> read NYM >> write NYM.
3. Stop 5th node >> read NYM >> write NYM.
4. Stop 4th node >> read NYM >> write NYM.
5. Stop 3rd node >> read NYM >> write NYM.
6. Start nodes from 3rd to 6th successively.
7. Try to write NYM.

Actual Results:
Step 7 NYM is not written to ledger so the pool has lost write consensus after descent to f+1 and recovery to >n-f.

Expected Results:
Pool should work write NYMs normally after >n-f.

Workaround:
Restart the whole pool to write NYMs.