AnimationTree(AnimationNodeStateMachine) error reported in the editor

[magian1127]

Godot version

4.1b

System information

win11 Vulkan API 1.3.236

Issue description

Selecting AnimationTree will result in error message
This function in this node can only be accessed from either the main thread or a thread group. Use call_deferred() instead.

Steps to reproduce

AnimationTree -> ROOT -> AnimationNodeStateMachine ->Add Animation.
There are several animations, clicking AnimationTree will result in several errors

Minimal reproduction project

test.zip

[AThousandShips]

This is due to recent threading improvements and seems some of it affects editor functionality

• Related ERROR: get_child_count: Caller thread can't call this function in this node. #78002

[magian1127]

4.1 B2
This function in this node (/root/@EditorNode@16972/@Control@6/@Panel@7/@VBoxContainer@15/@HSplitContainer@18/@HSplitContainer@26/@HSplitContainer@34/@VBoxContainer@35/@VSplitContainer@37/@PanelContainer@6807/@VBoxContainer@6808/@AnimationTreeEditor@12377) can only be accessed from either the main thread or a thread group. Use call_deferred() instead.

[magian1127]

Error by animation_tree_editor_plugin.cpp 224 row

Vector<String> AnimationTreeEditor::get_animation_list() {
	if (!singleton->is_visible()) { // this
		return Vector<String>();
	}

'is_visible()' triggered ERR_READ_THREAD_GUARD_V(false)