Just as a heads up: The change of the code about how the foreignKeyDirection is determined in `OneToOneSecondPass.doSecondPass(Map)` flips the direction of of some of our OneToOne annotations from TO_PARENT to FROM_PARENT since version 5.4.0, resulting in a lot of constraint violation exceptions when inserting data.

I don't yet know if the issue is on our side or not. I just want to give some early feedback to let you know that this change breaks some things for us that were working for over seven years.