Deadlock on connector initialization

Found one Java-level deadlock:
=============================
"pool-3-thread-1":
  waiting to lock monitor 0x00007fbc88006300 (object 0x0000000091002aa0, a org.apache.kafka.connect.runtime.standalone.StandaloneHerder),
  which is held by "Thread-9"
"Thread-9":
  waiting to lock monitor 0x00007fbc88008800 (object 0x000000009101ccd8, a org.apache.kafka.connect.storage.MemoryConfigBackingStore),
  which is held by "pool-3-thread-1"Java stack information for the threads listed above:
===================================================
"pool-3-thread-1":
    at org.apache.kafka.connect.runtime.standalone.StandaloneHerder$ConfigUpdateListener.onTaskConfigUpdate(StandaloneHerder.java:516)
    - waiting to lock <0x0000000091002aa0> (a org.apache.kafka.connect.runtime.standalone.StandaloneHerder)
    at org.apache.kafka.connect.storage.MemoryConfigBackingStore.putTaskConfigs(MemoryConfigBackingStore.java:137)
    - locked <0x000000009101ccd8> (a org.apache.kafka.connect.storage.MemoryConfigBackingStore)
    at org.apache.kafka.connect.runtime.standalone.StandaloneHerder.updateConnectorTasks(StandaloneHerder.java:483)
    at org.apache.kafka.connect.runtime.standalone.StandaloneHerder.lambda$null$2(StandaloneHerder.java:229)
    at org.apache.kafka.connect.runtime.standalone.StandaloneHerder$$Lambda$692/0x0000000840557440.run(Unknown Source)
    at java.util.concurrent.Executors$RunnableAdapter.call(java.base@11.0.21/Executors.java:515)
    at java.util.concurrent.FutureTask.run(java.base@11.0.21/FutureTask.java:264)
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(java.base@11.0.21/ScheduledThreadPoolExecutor.java:304)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(java.base@11.0.21/ThreadPoolExecutor.java:1128)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(java.base@11.0.21/ThreadPoolExecutor.java:628)
    at java.lang.Thread.run(java.base@11.0.21/Thread.java:829)
"Thread-9":
    at org.apache.kafka.connect.storage.MemoryConfigBackingStore.putTaskConfigs(MemoryConfigBackingStore.java:129)
    - waiting to lock <0x000000009101ccd8> (a org.apache.kafka.connect.storage.MemoryConfigBackingStore)
    at org.apache.kafka.connect.runtime.standalone.StandaloneHerder.updateConnectorTasks(StandaloneHerder.java:483)
    at org.apache.kafka.connect.runtime.standalone.StandaloneHerder.requestTaskReconfiguration(StandaloneHerder.java:255)
    - locked <0x0000000091002aa0> (a org.apache.kafka.connect.runtime.standalone.StandaloneHerder)
    at org.apache.kafka.connect.runtime.HerderConnectorContext.requestTaskReconfiguration(HerderConnectorContext.java:50)
    at org.apache.kafka.connect.runtime.WorkerConnector$WorkerConnectorContext.requestTaskReconfiguration(WorkerConnector.java:548)
    at io.confluent.connect.jdbc.source.TableMonitorThread.run(TableMonitorThread.java:86)

Found 1 deadlock.