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If in New Scene , I do a Append after / Device Change, I do get Error "Device's instances or command classes no longer exist: 4#0.32"
The message is not problematic for me, because I can continue editing the change in a device of choice.

This is because by default new field is created with some default selection. In your case it falls to a non-existing Command Class in device. This is not a bug nor a problem. This is about selection of default values. We will take this into account.