in BF-20634 we have an unclear cause of failure. It could be one of:

• dropRole could have failed, and since we are not checking result we can't tell it didn't
• call could have returned before replication completed, and since we are not checking primary first, we can't tell it's not the case

I am making an attempt to reproduce an issue on windows/debug, so far without success.

After discussion with xuerui.fa we decided following needs to be done:

• check that dropRole succeeds
• check that after dropRole succeeds, the role has indeed disappeared from primary before checking all other nodes

This will not address the root cause, but will help eliminate possibilities