I’m using the following entity structure with the inheritance pattern.

I want so select all animals and load all kittens as well if the animal is a cat.
I’m using the following query to load alls animals.

select animal from Animal animal left join fetch animal.kittens

In Hibernate 5 all kittens are loaded as expected. After the upgrade to hibernate 6 I get a LazyInitializationException on accessing the kittens

Testcase https://github.com/finn0s/hibernate-test-case-templates