store is_convert in Beatmap itself

src/mania/convert/mod.rs

@@ -170,6 +170,7 @@ fn convert(map: &mut Beatmap) {
     sort::osu_legacy(&mut map.hit_objects);
 
     map.mode = GameMode::Mania;
+    map.is_convert = true;
 }
 
 pub struct PrevValues {
@@ -224,9 +225,8 @@ mod tests {
             .unwrap()
             .unchecked_into_converted::<Mania>();
 
-        assert!(converted.is_convert);
-
         let map = converted.map;
+        assert!(map.is_convert);
 
         assert_eq!(map.mode, GameMode::Mania);
         assert_eq!(map.version, 14);

src/mania/difficulty/gradual.rs

@@ -110,7 +110,7 @@ impl ManiaGradualDifficulty {
             mods,
             clock_rate,
             objects_is_circle,
-            is_convert: converted.is_convert,
+            is_convert: converted.map.is_convert,
             strain,
             diff_objects,
             hit_window,

src/mania/difficulty/mod.rs

@@ -40,7 +40,7 @@ pub fn difficulty(
         hit_window,
         max_combo: values.max_combo,
         n_objects,
-        is_convert: converted.is_convert,
+        is_convert: converted.map.is_convert,
     }
 }