Validation error due to specVersion instead of specversion in the event payload

Versions:

	implementation group: 'io.cloudevents', name: 'cloudevents-spring', version: '2.4.0'
	implementation 'io.cloudevents:cloudevents-json-jackson:2.4.0'
	implementation 'com.fasterxml.jackson.datatype:jackson-datatype-jsr310:2.13.4'

Example payload:
{"data":{"value":"AN_EXAMPLE_JSON_PAYLOAD","id":"228ad7d1-dd16-4fd5-a02e-4b4bdcb7eaed","source":"service-test","type":"dummy.event","subject":null,"time":null,"specVersion":"V1","dataContentType":"application/cloudevents+json","dataSchema":null,"extensionNames":[],"attributeNames":["datacontenttype","specversion","id","source","type"]}

Getting following error:

org.springframework.messaging.MessageHandlingException: error occurred in message handler [bean 'serviceActivator.handler' for component 'serviceActivator']; nested exception is io.cloudevents.core.format.EventDeserializationException: com.fasterxml.jackson.databind.exc.MismatchedInputException: Missing mandatory specversion attribute

I am not sure if this is a known issue of if there is anything missing in the documentation to properly serialize the base event attributes.
Would appreciate any help here.

Regards,
Giriraj

Reproduce the reported deserialization failure using the example event payload and the listed CloudEvents Spring and Jackson dependencies. Trace how the JSON serializer emits the base attributes versus how deserialization looks up specversion; done when the payload round-trips without the missing mandatory attribute error and a regression test covers the spelling.