Missing config "read.only" will get NPE as below.

{
    "name": "inventory-connector",
    "config": {
        "connector.class": "io.debezium.connector.mysql.MySqlConnector",
        "tasks.max": "1",
        "database.hostname": "mysql",
        "database.port": "3306",
        "database.user": "debezium",
        "database.password": "dbz",
        "database.server.id": "184054",
        "snapshot.mode": "initial_only",
        "topic.prefix": "dbserver1",
        "database.include.list": "inventory",
        "schema.history.internal.kafka.bootstrap.servers": "kafka:9092",
        "signal.kafka.bootstrap.servers": "kafka:9092",
        "schema.history.internal.kafka.topic": "schema-changes.inventory",
        "signal.kafka.topic": "debezium_signal",
        "signal.enabled.channels": "source,kafka"
    }
} 

[2023-09-03 12:49:42,011] WARN [test_avro_with_inital_source|task-0] Action execute-snapshot failed. The signal SignalRecord{id='null', type='execute-snapshot', data='

', additionalData={channelOffset=6}} may not have been processed. (io.debezium.pipeline.signal.SignalProcessor:202)
java.lang.NullPointerException
at io.debezium.pipeline.signal.actions.snapshotting.ExecuteSnapshot.arrived(ExecuteSnapshot.java:74)
at io.debezium.pipeline.signal.SignalProcessor.processSignal(SignalProcessor.java:191)
at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183)
at java.base/java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1655)
at java.base/java.util.stream.ReferencePipeline$Head.forEach(ReferencePipeline.java:658)
at java.base/java.util.stream.ReferencePipeline$7$1.accept(ReferencePipeline.java:274)
at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:195)
at java.base/java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1655)
at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484)
at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474)
at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150)
at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173)
at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497)
at io.debezium.pipeline.signal.SignalProcessor.lambda$process$3(SignalProcessor.java:143)
at io.debezium.pipeline.signal.SignalProcessor.executeWithSemaphore(SignalProcessor.java:165)
at io.debezium.pipeline.signal.SignalProcessor.process(SignalProcessor.java:138)
at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
at java.base/java.util.concurrent.FutureTask.runAndReset(FutureTask.java:305)
at java.base/java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:305)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at java.base/java.lang.Thread.run(Thread.java:834)