ClassCastException when with @EmebedddedId and @OneToOne relationship

[DavideD]

See quarkusio/quarkus#47536 (comment)

[ERROR] org.acme.hibernate.orm.panache.ReproTest.test(TransactionalUniAsserter) -- Time elapsed: 0.124 s <<< ERROR!
java.lang.ClassCastException: class org.hibernate.sql.results.graph.entity.internal.EntitySelectFetchInitializer cannot be cast to class org.hibernate.reactive.sql.results.graph.ReactiveInitializer (org.hibernate.sql.results.graph.entity.internal.EntitySelectFetchInitializer and org.hibernate.reactive.sql.results.graph.ReactiveInitializer are in unnamed module of loader io.quarkus.bootstrap.classloading.QuarkusClassLoader @4cc7d00d)
	at org.hibernate.reactive.sql.results.graph.embeddable.internal.ReactiveEmbeddableInitializerImpl.lambda$forEachReactiveSubInitializer$0(ReactiveEmbeddableInitializerImpl.java:75)
	at org.hibernate.reactive.util.impl.CompletionStages.lambda$loop$2(CompletionStages.java:175)
	at org.hibernate.reactive.util.impl.CompletionStages.lambda$loop$7(CompletionStages.java:410)
	at org.hibernate.reactive.util.impl.CompletionStages$ArrayLoop.next(CompletionStages.java:484)

[DavideD]

I've added a test case here: DavideD@0154c69

The other commit in the same branch contains some initial changes attempting to solve the issues but they can be ignored