WIP

source/funkin/play/PlayState.hx

@@ -1796,6 +1796,7 @@ class PlayState extends MusicBeatSubState
     {
       if (note == null) continue;
 
+      // TODO: Does this properly account for offsets?
       var hitWindowStart = note.strumTime - Constants.HIT_WINDOW_MS;
       var hitWindowCenter = note.strumTime;
       var hitWindowEnd = note.strumTime + Constants.HIT_WINDOW_MS;
@@ -1865,7 +1866,10 @@ class PlayState extends MusicBeatSubState
       }
 
       // TODO: Potential penalty for dropping a hold note?
-      // if (holdNote.missedNote && !holdNote.handledMiss) { holdNote.handledMiss = true; }
+      if (holdNote.missedNote && !holdNote.handledMiss)
+      {
+        holdNote.handledMiss = true;
+      }
     }
 
     // Process notes on the player's side.

source/funkin/play/notes/Strumline.hx

@@ -343,7 +343,7 @@ class Strumline extends FlxSpriteGroup
           playStatic(holdNote.noteDirection);
           holdNote.missedNote = true;
           holdNote.visible = true;
-          holdNote.alpha = 0.0;
+          holdNote.alpha = 0.0; // Completely hide the dropped hold note.
         }
       }
 

source/funkin/play/notes/SustainTrail.hx

@@ -47,6 +47,11 @@ class SustainTrail extends FlxSprite
    */
   public var missedNote:Bool = false;
 
+  /**
+   * Set to `true` after handling additional logic for missing notes.
+   */
+  public var handledMiss:Bool = false;
+
   // maybe BlendMode.MULTIPLY if missed somehow, drawTriangles does not support!
 
   /**