Hello Jan Friedrich, thanks for reporting the issue. From what you’ve described, this seems closely related to https://hibernate.atlassian.net/browse/HHH-16494, in that you’re trying to (left) join an association to a sub-type entity in an inheritance structure, and expect only the records corresponding to that sub-type to be joined.

To be sure of this, though, we would need to see the complete mapping of you model or, even better, you could provide a simplified reproducer using our test case templates.

Meanwhile, the issue I mentioned has a work in progress fix, you can follow that for any updates.