Error message when trying to create a virtual copy

Question

I am having trouble creating a virtual copy of a photo. The strange thing is, it works with some photos, with others it doesn't. I can't find a pattern. This is the error message:
 
"Ein interner Fehler ist aufgetreten. entity:doneConstructing(): Field "propertySpec" does not have a value."

Does anybody hava an idea? Thank you very much.
I am using Lightroom Classic 10.4 on macOS Big Sur 11.6 on a MacBook Pro 13" M1.

IAmTheCameraEye · Accepted Answer

Problem dissapeared after updating to Lightroom Classic 11...

IAmTheCameraEye · Answer

In the console log, the following error message is shown:

standard 10:59:01.298522+0200 Adobe Lightroom Classic Oops! An untagged string (entity:doneConstructing(): Field "propertySpec" does not have a value.) got thrown far enough that we display it to the user. This shouldn't happen.

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