Доработка. Теперь пути загрузки сцен управляются редактором

scenes/эмс/кнопка-эмс.gd

@@ -3,21 +3,33 @@
 extends PanelContainer
 
 
-@export var texture_state0: Texture2D = preload('res://data/кнопка-эмс-1.png'):
-    set(val): $state.set_texture(val)
+@export var texture_state0: Texture2D:
+    set(val):
+        texture_state0 = val
+        if is_inside_tree():
+            $state.set_texture(val)
 
 
-@export var texture_state1: Texture2D = preload('res://data/кнопка-эмс-0.png'):
-    set(val): $state.set_texture(val)
+@export var texture_state1: Texture2D:
+    set(val):
+        texture_state1 = val
+        if is_inside_tree():
+            $state.set_texture(val)
 
 
 @export var text: String = '':
-    set(val): $button.set_text(val)
+    set(val):
+        text = val
+        if is_inside_tree():
+            $button.set_text(val)
     get: return $button.get_text()
 
 
 @export var pressed: bool = false:
-    set(val): $button.set_pressed(val)
+    set(val):
+        pressed = val
+        if is_inside_tree():
+            $button.set_pressed(val)
     get: return $button.is_pressed()
 
 
@@ -28,6 +40,14 @@ extends PanelContainer
     get: return $button.is_toggle_mode()
 
 
+func _enter_tree() -> void:
+    var tst = texture_state1 if $button.pressed else texture_state0
+    $state.set_texture(tst)
+    $button.set_text(text)
+    $button.set_pressed(pressed)
+    $button.set_toggle_mode(toggle_mode)
+
+
 func set_text        (val: String): $button.set_text(val)
 func set_pressed     (val: bool):   $button.set_pressed(val)
 

scenes/эмс/кнопка-эмс.tscn

@@ -1,7 +1,8 @@
-[gd_scene load_steps=9 format=3 uid="uid://gh3wqymu7cub"]
+[gd_scene load_steps=10 format=3 uid="uid://gh3wqymu7cub"]
 
 [ext_resource type="Script" uid="uid://dhqqyf2pd1scs" path="res://scenes/эмс/кнопка-эмс.gd" id="1_pmsh3"]
 [ext_resource type="Texture2D" uid="uid://nfpish471rjj" path="res://data/кнопка-эмс-1.png" id="2_0o537"]
+[ext_resource type="Texture2D" uid="uid://bvxv33noium2h" path="res://data/кнопка-эмс-0.png" id="3_okiyh"]
 
 [sub_resource type="StyleBoxEmpty" id="1"]
 
@@ -20,12 +21,14 @@ offset_right = 30.0
 offset_bottom = 30.0
 theme_override_styles/panel = SubResource("1")
 script = ExtResource("1_pmsh3")
+texture_state0 = ExtResource("2_0o537")
+texture_state1 = ExtResource("3_okiyh")
 toggle_mode = true
 
 [node name="state" type="NinePatchRect" parent="."]
 show_behind_parent = true
 layout_mode = 2
-texture = ExtResource("2_0o537")
+texture = ExtResource("3_okiyh")
 region_rect = Rect2(-1.60803, -1.94625, 31.9305, 25.9868)
 patch_margin_left = 6
 patch_margin_top = 5