2 questions about dropdown for custom entitytype

I have a small backend module where I manage data centrally. This data can be selected via a ContentType module by dropdown. As propertie type my domain model is chosen. So far everything works. Now I have two questions.

  1. if I have selected something and later call up the element again, the selection of the dropdown field is empty. So not pre-selected. But all elements are included and selectable. How can I fix this?
  2. we can intercept in the output if the linked object has been deleted, so that no error message comes but a default text? I always get an empty proxy element back:

Flow Variable Dump
Neos\Flow\Persistence\Doctrine\Proxies_ CG _\FOO\BAR\Domain\Model\ITEM