Zilla crashes with NPE in asyncapi.mqtt.kafka.proxy example

[ankitk-me]

Describe the bug
When running the asyncapi.mqtt.kafka.proxy example and sending a request, zilla crashes withjava.lang.NullPointerException.

To Reproduce
Steps to reproduce the behavior:

1. Go to asyncapi.mqtt.kafka.proxy
2. Start the example using ./setup.sh
3. Trigger mentioned request:

docker compose -p zilla-asyncapi-mqtt-kafka-proxy exec -T mosquitto-cli \
mosquitto_sub --url mqtt://zilla:7183/smartylighting/streetlights/1/0/event/+/lighting/measured --debug

4. See error

org.agrona.concurrent.AgentTerminationException: java.lang.NullPointerException: Cannot invoke "io.aklivity.zilla.runtime.binding.asyncapi.internal.types.stream.AsyncapiBeginExFW.apiId()" because "beginEx" is null
        at io.aklivity.zilla.runtime.engine@0.9.125/io.aklivity.zilla.runtime.engine.internal.registry.EngineWorker.doWork(EngineWorker.java:858)
        at org.agrona.core/org.agrona.concurrent.AgentRunner.doWork(AgentRunner.java:304)
        at org.agrona.core/org.agrona.concurrent.AgentRunner.workLoop(AgentRunner.java:296)
        at org.agrona.core/org.agrona.concurrent.AgentRunner.run(AgentRunner.java:162)
        at java.base/java.lang.Thread.run(Thread.java:1570)
Caused by: java.lang.NullPointerException: Cannot invoke "io.aklivity.zilla.runtime.binding.asyncapi.internal.types.stream.AsyncapiBeginExFW.apiId()" because "beginEx" is null
        at io.aklivity.zilla.runtime.binding.asyncapi@0.9.125/io.aklivity.zilla.runtime.binding.asyncapi.internal.stream.AsyncapiProxyFactory.newStream(AsyncapiProxyFactory.java:216)
        at io.aklivity.zilla.runtime.engine@0.9.125/io.aklivity.zilla.runtime.engine.internal.registry.EngineWorker.handleBeginInitial(EngineWorker.java:1593)
        at io.aklivity.zilla.runtime.engine@0.9.125/io.aklivity.zilla.runtime.engine.internal.registry.EngineWorker.handleDefaultReadInitial(EngineWorker.java:1357)
        at io.aklivity.zilla.runtime.engine@0.9.125/io.aklivity.zilla.runtime.engine.internal.registry.EngineWorker.handleReadInitial(EngineWorker.java:1297)
        at io.aklivity.zilla.runtime.engine@0.9.125/io.aklivity.zilla.runtime.engine.internal.registry.EngineWorker.handleRead(EngineWorker.java:1244)
        at io.aklivity.zilla.runtime.engine@0.9.125/io.aklivity.zilla.runtime.engine.internal.concurent.ManyToOneRingBuffer.read(ManyToOneRingBuffer.java:229)
        at io.aklivity.zilla.runtime.engine@0.9.125/io.aklivity.zilla.runtime.engine.internal.registry.EngineWorker.doWork(EngineWorker.java:852)
        ... 4 more
        Suppressed: java.lang.Exception: [engine/data#1]        [0x010100000000000f] streams=[consumeAt=0x000005b0 (0x00000000000005b0), produceAt=0x00000610 (0x0000000000000610)]
                at io.aklivity.zilla.runtime.engine@0.9.125/io.aklivity.zilla.runtime.engine.internal.registry.EngineWorker.doWork(EngineWorker.java:856)
                ... 4 more

Expected behavior
matt client should be able to subscribe to topics.