Logstash freezes post update to 6.2.4

Same here.

All ugly after this.
Apr 24 22:24:00 ent-mocsmlh04 systemd: Starting logstash...
Apr 24 22:24:22 ent-mocsmlh04 logstash: Sending Logstash's logs to /var/log/logstash which is now configured via log4j2.properties
Apr 24 22:25:22 ent-mocsmlh04 logstash: Exception in thread "Ruby-0-Thread-9@[main]>worker0: /usr/share/logstash/logstash-core/lib/logstash/pipeline.rb:385" org.logstash.ackedqueue.QueueRuntimeException: deserialize invocation error
Apr 24 22:25:22 ent-mocsmlh04 logstash: at org.logstash.ackedqueue.Queue.deserialize(Queue.java:733)
Apr 24 22:25:22 ent-mocsmlh04 logstash: at org.logstash.ackedqueue.Batch.deserializeElements(Batch.java:62)