Fix mania hold note head disappears

osu.Game.Rulesets.Mania/Objects/Drawables/DrawableHoldNoteHead.cs

@@ -36,6 +36,9 @@ protected override void UpdateHitStateTransforms(ArmedState state)
             // the hold note head should never change its visual state on its own due to the "freezing" mechanic
             // (when hit, it remains visible in place at the judgement line; when dropped, it will scroll past the line).
             // it will be hidden along with its parenting hold note when required.
+
+            // Set `LifetimeEnd` explicitly to a non-`double.MaxValue` because otherwise this DHO is automatically expired.
+            LifetimeEnd = double.PositiveInfinity;
         }
 
         public override bool OnPressed(KeyBindingPressEvent<ManiaAction> e) => false; // Handled by the hold note