I’ve run a small experiment on Confluence and indeed it seems that we have a bug in integration between REST v2 ↔ Confluence.
The error I received is:
io.atlassian.util.concurrent.LazyReference$InitializationException: A MultiException has 2 exceptions. They are:
1. java.util.ServiceConfigurationError: com.fasterxml.jackson.databind.Module: Provider com.fasterxml.jackson.datatype.joda.JodaModule not found
2. java.lang.IllegalStateException: Unable to perform operation: post construct on org.glassfish.jersey.jackson.internal.DefaultJacksonJaxbJsonProvider
I assume your error is caused by similar misconfiguration.
Please give us some time to fix the issue. We will need to make a separate milestone release for that 
I will make an update here, once it will be ready.