Migrate to C#12

Patch/Game/DecorationPatch.cs

@@ -16,7 +16,7 @@ public static class DecorationPatch
     public static bool IsEnabled =>
         RenderManager.Instance &&
         RenderManager.Instance.stage >= RenderStage.Load &&
-        RenderManager.Instance.Configuration?.AdvancedConfig?.HideFailedDecorations == true;
+        RenderManager.Instance.Configuration.AdvancedConfig.HideFailedDecorations;
 
     /// <summary>
     /// Checks whether the given sprite is the default placeholder or not-found sprite of the decoration manager.
@@ -46,7 +46,7 @@ public static class DecorationPatch
             {
                 if (IsPlaceholderSprite(visualDec.spriteRenderer.sprite, manager))
                 {
-                    visualDec.SetSprite((Sprite)null!);
+                    visualDec.SetSprite(null!);
                 }
             }
         }
@@ -61,6 +61,7 @@ public static class DecorationPatch
     public static class VisualDecorationSetSpritePatch
     {
         [HarmonyPrefix]
+        // ReSharper disable once InconsistentNaming
         public static void Prefix(scrVisualDecoration __instance, ref Sprite? sprite)
         {
             if (!IsEnabled || !sprite) return;