Scene export duplication error

[DragonMaster14545]

Tested versions

reproducable in v4.3.stable.steam [77dcf97]

System information

Godot v4.3.stable (77dcf97) - Windows 10.0.22631 - Vulkan (Mobile) - dedicated NVIDIA GeForce RTX 4070 Laptop GPU (NVIDIA; 31.0.15.3820) - Intel(R) Core(TM) i9-14900HX (32 Threads)

Issue description

Hi, so I experienced a similar issue a few times already, but I never was motivated to get a MRP up and running since I don't have any idea why this happens. So, this has to do something with creating a new node on runtime, adding it to the scene tree, propperly setting the owner and then going to the remote tree and saying export as scene on the root node or the node directly below it. This will give the following errors:

  <C++-Quelle>   scene/main/node.cpp:1688 @ get_child()

  <C++-Fehler>   Parameter "copy_child" is null.
  <C++-Quelle>   scene/main/node.cpp:2926 @ _duplicate_properties()

The export itsself is fine, but the through code added node is gone
This is verry anoying, because I often want to open my scene in the editor for debugging, and having a lot of stuff missing kinda defeats that purpose.
Thanks in advance

Steps to reproduce

Open the MRP, just click play, then go to the remote scene tree, right click either the root node or the Node3D node on the top, and the click export as scene and click ok

Minimal reproduction project (MRP)

MRP.zip

[AThousandShips]

Thank you for reporting, consolidating in:

• get_child error when duplicating .GLB model nodes with animations #96246

See there for more details, if you think something was missed about this and it's not the same issue, please comment here and it can be reopened

[DragonMaster14545]

@AThousandShips I just tested, my issue is not only with the model, I just swapped out the model loading with a simple Node3D, exact same error
MRP new.zip

[AThousandShips]

It's the same issue with the same origin, please test the PR:

• Don't duplicate internal nodes #89442

And add any new information to the other report