Accessed invalid expired 'Xform' prim

I am experiencing issues when creating layer references in Isaac Sim 2021.2. I am dragging a USD layer into an empty stage. The reference is created successfully, but an error is logged:

2021-12-02 14:54:38 [235,801ms] [Error] [omni.ui.python] RuntimeError: Accessed invalid expired 'Xform' prim </World/DB_BR_422_with_physics> 

  /home/brunovetter/.local/share/ov/pkg/isaac_sim-2021.2.0/exts/ build_items
  /home/brunovetter/.local/share/ov/pkg/isaac_sim-2021.2.0/kit/exts/ _build_frame

Thanks for any help

Our of curiosity, if you close the property window and then do this, does the error go away?

Can you provide a repro with an asset from the /Isaac folder? If its a bug in the property window I will follow up with that team.

Yes,the error goes away when the property window is closed.
No, I cannot reproduce the error with an asset from the /Isaac folder.

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