After migration of the testsuite to async engine (DBZ-7977) test on GH seems to be more or less stable, but on internal Jenkins instance I spotted several randomly failing tests, mostly related to improper start or stop of the engine:

• io.debezium.connector.mongodb.transforms.LegacyExtractNewDocumentStateTestIT.shouldDropDeleteMessagesByDefault

  java.lang.IllegalStateException: Cannot stop engine while tasks are starting, this may lead to leaked resource. Wait for the tasks to be fully started.
  	at io.debezium.embedded.async.AsyncEmbeddedEngine.close(AsyncEmbeddedEngine.java:246)
  	at io.debezium.embedded.async.TestingAsyncEmbeddedEngine.close(TestingAsyncEmbeddedEngine.java:34)
  	at io.debezium.embedded.AbstractConnectorTest.stopConnector(AbstractConnectorTest.java:167)
  	at io.debezium.embedded.AbstractConnectorTest.stopConnector(AbstractConnectorTest.java:152)
  	at io.debezium.connector.mongodb.AbstractMongoConnectorIT.afterEach(AbstractMongoConnectorIT.java:76)
  	at io.debezium.connector.mongodb.transforms.AbstractExtractNewDocumentStateTestIT.afterEach(AbstractExtractNewDocumentStateTestIT.java:88)
  	at io.debezium.connector.mongodb.transforms.AbstractExtractNewDocumentStateTestIT.restartConnectorWithoutEmittingTombstones(AbstractExtractNewDocumentStateTestIT.java:94)
  	at io.debezium.connector.mongodb.transforms.LegacyExtractNewDocumentStateTestIT.shouldDropDeleteMessagesByDefault(LegacyExtractNewDocumentStateTestIT.java:902)
  

• io.debezium.connector.mongodb.transforms.LegacyExtractNewDocumentStateTestIT.shouldRewriteDeleteMessage

  java.lang.IllegalStateException: Cannot stop engine while tasks are starting, this may lead to leaked resource. Wait for the tasks to be fully started.
  	at io.debezium.embedded.async.AsyncEmbeddedEngine.close(AsyncEmbeddedEngine.java:246)
  	at io.debezium.embedded.async.TestingAsyncEmbeddedEngine.close(TestingAsyncEmbeddedEngine.java:34)
  	at io.debezium.embedded.AbstractConnectorTest.stopConnector(AbstractConnectorTest.java:178)
  	at io.debezium.embedded.AbstractConnectorTest.stopConnector(AbstractConnectorTest.java:163)
  	at io.debezium.connector.mongodb.AbstractMongoConnectorIT.afterEach(AbstractMongoConnectorIT.java:76)
  	at io.debezium.connector.mongodb.transforms.AbstractExtractNewDocumentStateTestIT.afterEach(AbstractExtractNewDocumentStateTestIT.java:88)
  	at io.debezium.connector.mongodb.transforms.AbstractExtractNewDocumentStateTestIT.restartConnectorWithoutEmittingTombstones(AbstractExtractNewDocumentStateTestIT.java:94)
  	at io.debezium.connector.mongodb.transforms.LegacyExtractNewDocumentStateTestIT.shouldRewriteDeleteMessage(LegacyExtractNewDocumentStateTestIT.java:938)
  

• io.debezium.connector.postgresql.RecordsStreamProducerIT.stopInTheMiddleOfTxAndResume

  java.lang.IllegalStateException: Engine is already being shutting down.
  	at io.debezium.embedded.async.AsyncEmbeddedEngine.close(AsyncEmbeddedEngine.java:251)
  	at io.debezium.embedded.async.TestingAsyncEmbeddedEngine.close(TestingAsyncEmbeddedEngine.java:34)
  	at io.debezium.embedded.AbstractConnectorTest.stopConnector(AbstractConnectorTest.java:167)
  	at io.debezium.embedded.AbstractConnectorTest.stopConnector(AbstractConnectorTest.java:152)
  	at io.debezium.connector.postgresql.RecordsStreamProducerIT.stopInTheMiddleOfTxAndResume(RecordsStreamProducerIT.java:2669)
  

• io.debezium.connector.sqlserver.SqlServerConnectorIT.updatePrimaryKeyTwiceWithRestartInMiddleOfTx

  java.lang.IllegalStateException: Engine is already being shutting down.
  	at io.debezium.embedded.async.AsyncEmbeddedEngine.close(AsyncEmbeddedEngine.java:251)
  	at io.debezium.embedded.async.TestingAsyncEmbeddedEngine.close(TestingAsyncEmbeddedEngine.java:34)
  	at io.debezium.embedded.AbstractConnectorTest.stopConnector(AbstractConnectorTest.java:167)
  	at io.debezium.embedded.AbstractConnectorTest.stopConnector(AbstractConnectorTest.java:152)
  	at io.debezium.connector.sqlserver.SqlServerConnectorIT.updatePrimaryKeyTwiceWithRestartInMiddleOfTx(SqlServerConnectorIT.java:767)