Error while loading from nested scenes. bones array is empty.

[nelsonayamashita]

Maybe related to godotengine/godot#73247 and #3.

Steps to reproduce:

• Install the SoftBody2D node plugin from the asset lib.
• Create a SoftBody2D with any texture.
• Create a "World" scene. Add a Node2D as root and then instantiate the previously created SoftBody as a child scene.
• Create a "Main" scene. Add a node as root, then add the previously created "World" scene as a child scene.
• Execute the Main scene, it'll probably run fine.
• Go to Project -> Reload Current Project
• Execute the Main scene again.

A Out of bounds get index '0' (on base: 'Array[Node]') error will appear, saying that the line with

softbodyrb.bone = bones.filter(func(bone): return bone.name == child.name)[0]

Caused the error, which is strange, since in the debugger the bones array appears to be populated...

My current workaround is to delete the World scene from the Main scene and add a script to the Main scene that adds the World scene via code:

extends Control

var path_to_level := preload("res://world.tscn")

func _ready() -> void:
    var next_level = path_to_level.instantiate()
    add_child(next_level)

I believe this is related to the way Godot is having problems with how bones are being cached and loading them, so I don't think this can be easily fixed within the plugin. But the workaround might help someone also facing the problem.

Minimal reproduction project

Soft-Body-Issue.zip

Steps to reproduce the issue in the MRP

• Download zip file and extract the project
• Open the project in Godot and run the main scene
• Should throw the same error as described above

[Ughuuu]

Hm, sorry for late respond. I'm checking it now, but it does seem weird error, at least I never saw it happen.

Also, can't seem to download ur minimal reproduction project.

[nelsonayamashita]

Hey, no problem! Thanks for checking the issue. I've re-uploaded the file in the OP, let me know if it's working now.

[Ughuuu]

Seems to be the plugin tries to recreate the softbody even if there aren't any changes in it. Will try to fix so it doesn't happen(eg. add a dirty state if there is such a thing).

[Ughuuu]

Seems to no longer occur in 4.3