Clone entity (order) with extension (many to one) fails as the foreign key is not cloned

[AndreasA]

PHP Version

8.1

Shopware Version

6.3.5.2, probably also newer.

Expected behaviour

When cloning an order e.g. with an additional state field that information is lost, as the foreign key is not cloned as extensions do not just include the ID, so the ID is lost.

see also https://issues.shopware.com/issues/NEXT-12524

I am mostly interested in an update regarding this.

Actual behaviour

Data is lost, e.g. when a state is added to order and it is cloned (edited).

How to reproduce

Add a state machine field extension to the order, assign a value, edit/clone it and the data is lost.