Updating .blend file does not reflect in @export variable PackedScene

[ManasMakde]

Tested versions

v4.2.2.stable.official [15073afe3]

System information

Godot v4.2.2.stable - Ubuntu 22.04.4 LTS 22.04 - X11 - Vulkan (Forward+) - dedicated NVIDIA GeForce GTX 1660 Ti (nvidia; 535.183.01) - AMD Ryzen 7 4800H with Radeon Graphics (16 Threads)

Issue description

Updating a .blend file in blender does not reflect changes in the @export variable:PackedScene rather it creates a PackedScene of the old .blend file

Steps to reproduce

I have an exported variable as such:

@export var my_blend_scene:PackedScene

and I've passed a blend file as a scene into it as such:

but whenever I update & save the .blend file in blender (version 3.6.9) and then open godot again, the export variable does not update rather it creates a PackedScene of the old blend file:

If this is the intended behaviour, then is there any other way to keep the exported variable in sync with the .blend file?

Minimal reproduction project (MRP)

Blend File Export (MRP).zip

[fire]

Can you check behavior in 4.3 beta3 I suspect that there were some bugfixes.

[ManasMakde]

@fire yep it's fixed in v4.3.beta3.official [82cedc83c],

when I Open Scene via the @export my_blend_scene in the inspector it shows the updated version, However when I view the instantiated $Main/cube it no longer updates

https://github.com/user-attachments/assets/749f01ea-d435-4eea-85c6-7c52264cb1b7

so this seems to be a new bug now :/

Edit:
I tested this in v4.2.2.stable.official [15073afe3] as well and the instantiated $Main/cube does update when updating the .blend file

[fire]

I noticed you didn't save the instantiated $Main/cube so it no longer updates so I suspect it isn't being tracked for reloading as designed?

I think this new behaviour might be wanted. Let me know how it affects your workflows.

[ManasMakde]

@fire could you elaborate what you mean by "save the instantiated $Main/cube" ? Do you mean like save it as a separate scene? or do you mean save the entire Main scene (as in just pressing Ctrl + s)?

Also after some testing I found out that if I pass the cube.blend as an argument to my_blend_scene then the $Main/cube does not update BUT if I remove it as an argument then it starts tracking updates

https://github.com/user-attachments/assets/943f9523-9352-452e-b5a6-135640211dce

Not sure but maybe some issue with the reference count?

Edit: Turns out the inconsistent updating might be related to #75970 If that issue is resolved maybe this will be solved too (will have to test before closing though)

[yahkr]

@ManasMakde This issue appears to be resolved in v4.3.rc.custom_build [3e0c10d39] can you confirm?

[ManasMakde]

@yahkr yep it seems to be resolved now, closing this issue

Edit: I had a problem where updating a .blend file and then instancing it did not give the updated version:

var cube = load("res://cube.blend").instance(PackedScene.GEN_EDIT_STATE_INSTANCE)
self.add_child(cube)
cube.owner = get_tree().edited_scene_root

Turns out it was an issue with cache and as far as I can tell godot was instancing the old cached version of the .blend file, to fix it I adjusted the code as such:

var cube = ResourceLoader.load("res://cube.blend", "", ResourceLoader.CACHE_MODE_IGNORE).instance(PackedScene.GEN_EDIT_STATE_INSTANCE)
self.add_child(cube)
cube.owner = get_tree().edited_scene_root

Hope this helps :)