Linq Fetch over component after fetching a many-to-one throws exception

[cremor]

I have a Linq query that looks like this:

session.Query<MyEntity>()
    .Fetch(x => x.UnrelatedManyToOneProperty)
    .Fetch(x => x.ComponentProperty).ThenFetch(x => x.ManyToOneInComponent)
    .Where(x => x.Id == someId)
    .ToArray();

This query worked in NHibernate 5.2.7 (although it didn't actually fetch the many-to-one in the component, see #1232). But with NHibernate 5.3.2 this query now throws an exception:

InvalidOperationException: Property x.ComponentProperty does not exist on entity TypeOfUnrelatedManyToOneProperty
   at NHibernate.Persister.Entity.AbstractEntityPersister.PropertySelectFragment(String name, String suffix, ICollection`1 fetchProperties, Boolean allProperties)

If I remove the .Fetch(x => x.UnrelatedManyToOneProperty) part of the query it works (and even correctly fetches the many-to-one in the component, which means that #1232 was fixed, except that we now have this regression).