Document undefined sprite template behavior

gflib/sprite.c

@@ -878,12 +878,14 @@ void ResetAllSprites(void)
     ResetSprite(&gSprites[i]);
 }
 
+// UB: template pointer may point to freed temporary storage
 void FreeSpriteTiles(struct Sprite *sprite)
 {
     if (sprite->template->tileTag != 0xFFFF)
         FreeSpriteTilesByTag(sprite->template->tileTag);
 }
 
+// UB: template pointer may point to freed temporary storage
 void FreeSpritePalette(struct Sprite *sprite)
 {
     FreeSpritePaletteByTag(sprite->template->paletteTag);

gflib/sprite.h

@@ -182,6 +182,10 @@ struct SpriteTemplate
     SpriteCallback callback;
 };
 
+// UB: template pointer is often used to point to temporary storage,
+// then later dereferenced after being freed. Usually this won't
+// be visible in-game, but this is (part of) what causes the item
+// icon palette to flicker when changing items in the bag.
 struct Sprite
 {
     /*0x00*/ struct OamData oam;

src/mevent2.c

@@ -484,10 +484,14 @@ static void sub_801B7D8(u32 command)
         }
 
         if (dest == NULL)
+        {
             AGB_ASSERT(0);
+        }
         else if (++(*dest) > 999)
+        {
             *dest = 999;
         }
+    }
 }
 
 u16 mevent_081445C0(u32 command)