diff --git a/agrf/lib/building/layout.py b/agrf/lib/building/layout.py
index c41a90f1..e75643ba 100644
--- a/agrf/lib/building/layout.py
+++ b/agrf/lib/building/layout.py
@@ -32,11 +32,12 @@ def __init__(self, *args, flags=None, **kwargs):
         super().__init__(*args, **kwargs)
         self.flags = flags or {}
 
+    @property
+    def flags_translated(self):
+        return {k: (v if k == "add" else v.get_index()) for k, v in self.flags.items() if v is not None}
+
     def registers_to_grf_dict(self):
-        return {
-            "flags": sum(grf.SPRITE_FLAGS[k][1] for k in self.flags.keys()),
-            "registers": {k: (v if k == "add" else v.get_index()) for k, v in self.flags.items() if v is not None},
-        }
+        return {"flags": sum(grf.SPRITE_FLAGS[k][1] for k in self.flags.keys()), "registers": self.flags_translated}
 
 
 class GroundSpriteMixin:
@@ -246,16 +247,6 @@ def demo_translate(self, xofs, yofs, zofs):
             self.flags,
         )
 
-    @functools.cache
-    def filter_register(self, reg):
-        return ADefaultParentSprite(
-            self.sprite,
-            self.extent,
-            self.offset,
-            [x for x in self.child_sprites if x.flags.get("dodraw") != reg],
-            self.flags,
-        )
-
     @property
     def L(self):
         return self
@@ -333,6 +324,7 @@ def to_action2(self, sprite_list):
                 "sprite": grf.SpriteRef(sprite_list.index(self.sprite), is_global=False),
                 "offset": self.offset,
                 "extent": self.extent,
+                **self.flags_translated,
             }
         ] + [s for x in self.child_sprites for s in x.to_action2(sprite_list)]
 
@@ -370,16 +362,6 @@ def squash(self, ratio):
             self.flags,
         )
 
-    @functools.cache
-    def filter_register(self, reg):
-        return AParentSprite(
-            self.sprite,
-            self.extent,
-            self.offset,
-            [x for x in self.child_sprites if x.flags.get("dodraw") != reg],
-            self.flags,
-        )
-
     @property
     def L(self):
         return self
@@ -452,7 +434,13 @@ def to_grf(self, sprite_list):
         )
 
     def to_action2(self, sprite_list):
-        return [{"sprite": grf.SpriteRef(sprite_list.index(self.sprite), is_global=False), "pixel_offset": self.offset}]
+        return [
+            {
+                "sprite": grf.SpriteRef(sprite_list.index(self.sprite), is_global=False),
+                "pixel_offset": self.offset,
+                **self.flags_translated,
+            }
+        ]
 
     def graphics(self, scale, bpp, climate="temperate", subclimate="default"):
         if self.sprite is grf.EMPTY_SPRITE:
@@ -581,12 +569,6 @@ def raise_tile(self, delta=1):
     def lower_tile(self, delta=1):
         return self.raise_tile(-delta)
 
-    @functools.cache
-    def filter_register(self, reg):
-        return replace(
-            self, parent_sprites=[s.filter_register(reg) for s in self.parent_sprites if s.flags.get("dodraw") != reg]
-        )
-
     @functools.cache
     def demo_translate(self, xofs, yofs):
         from station.stations.misc import empty_ground