Single instance testing isn't working

[Totktonada]

What I see on the 'jepsen-single-instance' job in tarantool (postprocessed logs):

2021-10-27T09:05:54.9580285Z 
:workload :bank-lua,
clojure.lang.ExceptionInfo: throw+: {:type :empty-grudge, :grudge {"89.208.228.127" #{}}, :node "89.208.228.127"}
clojure.lang.ExceptionInfo: throw+: {:type :empty-grudge, :grudge {"89.208.228.127" #{}}, :node "89.208.228.127"}
Everything looks good! ヽ(‘ー`)ノ 
2021-10-27T09:18:01.2961242Z 

2021-10-27T09:18:01.4252200Z 
:workload :bank-multitable-lua,
clojure.lang.ExceptionInfo: throw+: {:type :empty-grudge, :grudge {"89.208.228.127" #{}}, :node "89.208.228.127"}
clojure.lang.ExceptionInfo: throw+: {:type :empty-grudge, :grudge {"89.208.228.127" #{}}, :node "89.208.228.127"} 
Everything looks good! ヽ(‘ー`)ノ 
2021-10-27T09:20:11.8104307Z 

2021-10-27T09:20:11.9301155Z 
:workload :set,
java.sql.SQLException: Failed to execute SQL: INSERT INTO sets (value) VALUES (?), params: [0]
Caused by: org.tarantool.TarantoolException: The synchronous transaction queue doesn't belong to any instance
<..skipped repeated messages..>
clojure.lang.ExceptionInfo: throw+: {:type :empty-grudge, :grudge {"89.208.228.127" #{}}, :node "89.208.228.127"}
<..skipped repeated messages..>
Analysis invalid! (ﾉಥ益ಥ）ﾉ ┻━┻
2021-10-27T09:22:47.8019469Z 

2021-10-27T09:22:48.7684703Z 
:workload :register,
java.sql.SQLException: Failed to execute SQL: SELECT _UPSERT(0, 2, 'REGISTER'), params: []
Caused by: org.tarantool.TarantoolException: The synchronous transaction queue doesn't belong to any instance
<..skipped repeated messages..> 
Analysis invalid! (ﾉಥ益ಥ）ﾉ ┻━┻ 
2021-10-27T09:26:21.5315705Z

Full logs: logs.txt.

My findings:

• The grudge exception fail a nemesis process and is considered as a warning. Not insterested for us here.
• 'bank-lua' and 'bank-multitable-lua' work, 'set' and 'register' fails.
• The failed tests uses synchronous spaces.
• After some tarantool's commit, we should call box.ctl.promote() on a new leader, when RAFT is not used for leader election. It seems, even when we have just one instance. See Implement memtx transaction isolation levels for Vinyl tarantool#5522 (comment) (from this comment and below).

It seems, we should add box.ctl.promote() after box.cfg() for single instance configuration.