Importing .fbx files results in circular dependency errors when trying to instantiate the file in an unsaved scene through the 3D Viewport.

[ByteWiseLogic]

Tested versions

• Reproduced in 4.3dev5.mono
• Not reproducible in 4.2.stable
• Not reproducible in 4.2.stable.mono

System information

Godot v4.3.dev5.mono - Windows 10.0.22631 - Vulkan (Forward+) - dedicated NVIDIA GeForce GTX 1050 (NVIDIA; 31.0.15.5212) - 12th Gen Intel(R) Core(TM) i5-12400F (12 Threads)

Issue description

I can't drag and drop .fbx files into the 3D viewport when editing in a new unsaved scene, due to Circular Dependencies. The same issue goes for new scenes that contain the .fbx file in the node tree.
I'm supposed to be able to just drag and drop the files into the 3D viewport.

Steps to reproduce

Make sure to import the provided model using the ufbx importer.

1. Drag the provided FBX model into the 3D viewport, after which the editor will crash.
2. If you followed step 1. Reopen the editor.
3. Then create a new scene, add any Node3D as the root node. But do not save the scene yet.
4. Drag any FBX into the 3D Viewport. You'll then get an error at the bottom left of the viewport, stating "Can't instantiate: Circular dependency found at SK_Chr_Alien_01.fbx"
5. If you open MRP.tscn and drag the FBX file into the viewport, you won't run into any issues.

Conclusion: Dragging FBX files into the viewport in an unsaved scene, results in a circular dependency error. I have not tested this with other file formats.

Minimal reproduction project (MRP)

MRP.zip
MRP is not needed, however one will still be provided.

[WorldNulptr]

It happened to 4.3-dev5 too

[fire]

I'm curious if this happens with a gltf file too, I suspect it might be a general issue.

[fire]

Need to check if #92279 fixes this

[fire]

From my testing I think #92279 fixes this.

Screen.Recording.2024-05-24.at.10.16.30.AM.mov

[fire]

Testing on 4.3dev5.mono

1. drag fbx into the empty scene crashes
2. making a new node and dragging into the viewport doesn't crash
3. opening the tscn and dragging into the viewport doesn't crash

[fire]

Should be fixed by #92279