A regression was introduced when load plans were introduced in 4.3 that results in many-to-one associations to be eagerly loaded if they are embedded in an embeddable collection element.
When a Parent entity is loaded, containedChild.child will be lazy (as expected).
When a Parent#containedChildren is initialized, the child contained in each ContainedChild collection element will be non-lazy. These child entities should be lazy.
I believe that many-to-one associations in composite IDs will also be eagerly loaded, even when mapped as lazy. I need to look into this further though.