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Form related events have been trying to treat IEF (inline entity form) in a special way but never really got that working to the full extend. As there are forthcoming changes in IEF as well which will make this even harder, we've decided to remove that special handling entirely. This will also prevent a few odd behaviours, that have been reported in the past. But if you're using IEF in your workflows, please double check that your models are still working as expected.