What are the limiations of subject names within the Confluent schema registry?
In particular I would like to know:

I have installed confluent schema registry based on “https://packages.confluent.io/archive/7.6/confluent-7.6.0.zip” on my on-premise
Kubernetes cluster,and pointing it to _schemas topic in Confluent Cloud Kafka.

we are pushing an event into a topic , but getting an error `Schema being registered is incompatible with an earlier schema for subject “x.proto” this schema has a reference of other schema also .
details: [{errorType:”ONEOF_FIELD_REMOVED”, description:”The old schema is missing a oneof field at path ‘#/y/schema/2’ in the new schema” .
does the updated schema get registered itself when producer trying to publish an event into a topic , or it first pass the compatibility check , then only get registered