ClassCastException with MapsId, EmbeddedId, and many-to-one

[DavideD]

From quarkus: quarkusio/quarkus#48033

Error:

class org.hibernate.sql.results.graph.embeddable.internal.EmbeddableInitializerImpl cannot be cast to class org.hibernate.reactive.sql.results.graph.ReactiveInitializer (org.hibernate.sql.results.graph.embeddable.internal.EmbeddableInitializerImpl and org.hibernate.reactive.sql.results.graph.ReactiveInitializer are in unnamed module of loader 'app')
java.lang.ClassCastException: class org.hibernate.sql.results.graph.embeddable.internal.EmbeddableInitializerImpl cannot be cast to class org.hibernate.reactive.sql.results.graph.ReactiveInitializer (org.hibernate.sql.results.graph.embeddable.internal.EmbeddableInitializerImpl and org.hibernate.reactive.sql.results.graph.ReactiveInitializer are in unnamed module of loader 'app')
	at org.hibernate.reactive.sql.results.graph.embeddable.internal.ReactiveEmbeddableInitializerImpl.lambda$forEachReactiveSubInitializer$0(ReactiveEmbeddableInitializerImpl.java:85)
	at org.hibernate.reactive.util.impl.CompletionStages.lambda$loop$3(CompletionStages.java:195)
	at org.hibernate.reactive.util.impl.CompletionStages.lambda$loop$8(CompletionStages.java:483)
	at org.hibernate.reactive.util.impl.CompletionStages$ArrayLoop.next(CompletionStages.java:557)
	at org.hibernate.reactive.util.async.impl.AsyncTrampoline.lambda$asyncWhile$1(AsyncTrampoline.java:215)
	at org.hibernate.reactive.util.async.impl.AsyncTrampoline$TrampolineInternal.unroll(AsyncTrampoline.java:121)
	at org.hibernate.reactive.util.async.impl.AsyncTrampoline$TrampolineInternal.trampoline(AsyncTrampoline.java:102)
	at org.hibernate.reactive.util.async.impl.AsyncTrampoline.asyncWhile(AsyncTrampoline.java:197)

I've adapated the original Quarkus test for Hibernate Reactive here: DavideD@13509e6