JAX-RS ExceptionMapper not catch javax.validation.ConstraintViolationException

Question

I have started using javax.validation's @Valid annotation to validate data arriving at my REST endpoints. This is working as expected and throwing applicable exceptions:

Caused by: javax.validation.ConstraintViolationException: Validation failed for classes [org.<...>.crs.model.RegistrantEntity] during update time for groups [javax.validation.groups.Default, ]
List of constraint violations:[
    ConstraintViolationImpl{interpolatedMessage='Email address is invalid', propertyPath=email, rootBeanClass=class org.<...>.crs.model.RegistrantEntity, messageTemplate='Email address is invalid'}

My understanding of the ExceptionMapper is that i should be able to do this:

import javax.validation.ConstraintViolationException;

import javax.ws.rs.core.Response;
import javax.ws.rs.ext.ExceptionMapper;
import javax.ws.rs.ext.Provider;

@Provider
public class ConstraintViolationExceptionHandler implements ExceptionMapper<ConstraintViolationException> {
    @Override
    public Response toResponse(ConstraintViolationException exception) {
        return Response.status(Response.Status.BAD_REQUEST).entity(exception).build();
    }
}

Which should catch that exception and specify an appropriate Response object to send back.

This however is not working, here is the full top-level stacktrace items:

14:40:46,357 ERROR [org.jboss.as.ejb3.invocation] (default task-1) WFLYEJB0034: Jakarta Enterprise Beans Invocation failed on component AnswerResource for method public javax.ws.rs.core.Response org.<…>.crs.api.AnswerResource.updateAnswer(org.<…>.crs.api.model.Answer,java.util.UUID,java.lang.String) throws java.net.URISyntaxException,java.io.IOException: javax.ejb.EJBTransactionRolledbackException: javax.transaction.RollbackException: ARJUNA016053: Could not commit transaction.
…
Caused by: javax.transaction.RollbackException: ARJUNA016053: Could not commit transaction.
…
    Suppressed: javax.transaction.RollbackException: WFTXN0061: Transaction is marked rollback-only
…
    Suppressed: javax.transaction.RollbackException: WFTXN0061: Transaction is marked rollback-only
…
Caused by: javax.validation.ConstraintViolationException: Validation failed for classes [org.<…>.crs.model.RegistrantEntity] during update time for groups [javax.validation.groups.Default, ]
List of constraint violations:[
    ConstraintViolationImpl{interpolatedMessage='Email address is invalid', propertyPath=email, rootBeanClass=class org.<…>.crs.model.RegistrantEntity, messageTemplate='Email address is invalid'}
]

My understanding is that the ConstraintViolationException, while being the cause, has been packaged in the RollbackException and as such is not caught by ExceptionMapper.

1. Can someone confirm this?
2. If so, is there a way to override this behavior and catch any exception containing a ConstraintViolationException inside it?
3. If not, what would be a good work around?

Thoughts?

Thanks.