Importing meshes hangs forever

Godot version

4.0.x / 4.1

System information

Windows 11, Ubuntu

Issue description

I am currently using Godot-MagicaVoxel-Importer-with-Extensions to import Magica Voxel files. It does work, when i add a single file. Which results in a imported mesh file. But as soon as i add several files it just hangs and never finishes the import.

I described the issue in the bugtracker for the extension here, as i first thought it was related to the plugin itself. But i further investigated and found out that it may be instead an issue of godot itself. In the plugin i replaced to import code and instead simply created an Empty ArrayMesh and passed it to the RsourceSaver. It also never finishes the import. I tryed the same with Godot 3.5 which works without any issue.

Steps to reproduce

Create a simple importer and use following implementation for the _import Method:

func _import(source_path, destination_path, options, _platforms, _gen_files):
var full_path = "%s.%s" % [ destination_path, _get_save_extension() ]
var m = ArrayMesh.new();
return ResourceSaver.save(m, full_path)

Create an empty project
Add several files which fits the importers extension (I currently belive it must be more then 20)
Let the importer run by adding/enabling the importer to the project

The import will never end. It seems like the first few files will be imported and then all other files will be created in the.import file but will all have a size of zero.

Minimal reproduction project

To reproduce the issue, you can use the Godot-MagicaVoxel-Importer-with-Extensions. You can also replace the _import Method with above implementation.

godotengine / godot