> Related: why are child objects not automatically detached if the
> parent is detached? Would that not not logical?

JPA doesn't have "fetch groups" as such, just a "default fetch group".
This is defined by which fields are EAGER loaded. So if you had your
field marked as EAGER then it would be detached. By default 1-N fields
are LAZY hence not detached.

The reason we don't just detach child objects is that of where do you
stop ? Detach a full object graph ? That'd hammer the performance on
some graphs, hence done using the fetch groups etc.

Try accessing the field before the detach. The log will tell you
whether/when it is detached.

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