fixed object count for mania converts

src/beatmap/converts/mania/mod.rs

@@ -143,7 +143,7 @@ impl Beatmap {
 
                     for new_pattern in gen.generate() {
                         let new_objects = new_pattern.hit_objects.iter().map(|h| {
-                            if obj.is_circle() {
+                            if h.is_circle() {
                                 n_circles += 1;
                             } else {
                                 n_sliders += 1;

src/beatmap/mod.rs

@@ -119,6 +119,12 @@ impl Beatmap {
     }
 
     /// Convert a [`Beatmap`] of some mode into a different mode.
+    ///
+    /// # Note
+    /// - Since hitsounds are irrelevant for difficulty and performance calculations
+    /// in osu!mania, the resulting map of a conversion to mania will not contain hitsounds.
+    /// - To avoid having to clone the map for osu!catch conversions, the field `Beatmap::mode`
+    /// will not be adjusted in a ctb-converted map.
     #[inline]
     pub fn convert_mode(&self, mode: GameMode) -> Cow<'_, Self> {
         if mode == self.mode {