Blender Fix Script - Please copy and run after import!

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import bpy

for obj in bpy.data.objects:
	bpy.ops.object.select_all(action='DESELECT') # deselect all objects
	if obj.type=="EMPTY":
		if len(obj.children)>0:
			if obj.children[0].type=="MESH":
				print(obj.children)
				for child in obj.children:
					child.select_set(True)
				with bpy.context.temp_override(active_object=obj.children[0],selected_objects=obj.children):
					bpy.ops.object.join()
				print("JOINED: " + obj.name)

for mat in bpy.data.materials:
	obj_set=[]
	bpy.ops.object.select_all(action='DESELECT') # deselect all objects
	for obj in bpy.data.objects:
		if obj.users>0 and obj.parent==None and len(obj.material_slots)==1:
			if obj.material_slots[0].name==mat.name:
				obj_set.append(obj)
				obj.select_set(True)
	if len(obj_set)>0:
		print(mat.name)
		with bpy.context.temp_override(active_object=obj_set[0],selected_objects=obj_set):
			bpy.ops.object.join()
		print("JOINED: " + mat.name)

for mat in bpy.data.materials:
	if mat.node_tree.nodes.get("Principled BSDF", None) is not None:
		mat.node_tree.nodes["Principled BSDF"].inputs["Specular"].default_value = 0