diff --git a/osu.Game/Beatmaps/BeatmapConverter.cs b/osu.Game/Beatmaps/BeatmapConverter.cs
index b68c80d4b3..0ec8eab5d8 100644
--- a/osu.Game/Beatmaps/BeatmapConverter.cs
+++ b/osu.Game/Beatmaps/BeatmapConverter.cs
@@ -7,6 +7,8 @@ using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Threading;
+using osu.Framework.Bindables;
+using osu.Game.Beatmaps.Timing;
 using osu.Game.Rulesets;
 using osu.Game.Rulesets.Objects;
 
@@ -49,6 +51,9 @@ namespace osu.Game.Beatmaps
             original.BeatmapInfo = original.BeatmapInfo.Clone();
             original.ControlPointInfo = original.ControlPointInfo.DeepClone();
 
+            // Used in osu!mania conversion.
+            original.Breaks = new BindableList<BreakPeriod>(original.Breaks);
+
             return ConvertBeatmap(original, cancellationToken);
         }
 
diff --git a/osu.Game/Beatmaps/IBeatmap.cs b/osu.Game/Beatmaps/IBeatmap.cs
index 072e246a36..d8a2560559 100644
--- a/osu.Game/Beatmaps/IBeatmap.cs
+++ b/osu.Game/Beatmaps/IBeatmap.cs
@@ -41,7 +41,7 @@ namespace osu.Game.Beatmaps
         /// <summary>
         /// The breaks in this beatmap.
         /// </summary>
-        BindableList<BreakPeriod> Breaks { get; }
+        BindableList<BreakPeriod> Breaks { get; set; }
 
         /// <summary>
         /// All lines from the [Events] section which aren't handled in the encoding process yet.
diff --git a/osu.Game/Rulesets/Difficulty/DifficultyCalculator.cs b/osu.Game/Rulesets/Difficulty/DifficultyCalculator.cs
index 4c6a4cc9c2..97037302c6 100644
--- a/osu.Game/Rulesets/Difficulty/DifficultyCalculator.cs
+++ b/osu.Game/Rulesets/Difficulty/DifficultyCalculator.cs
@@ -328,7 +328,12 @@ namespace osu.Game.Rulesets.Difficulty
                 set => baseBeatmap.Difficulty = value;
             }
 
-            public BindableList<BreakPeriod> Breaks => baseBeatmap.Breaks;
+            public BindableList<BreakPeriod> Breaks
+            {
+                get => baseBeatmap.Breaks;
+                set => baseBeatmap.Breaks = value;
+            }
+
             public List<string> UnhandledEventLines => baseBeatmap.UnhandledEventLines;
 
             public double TotalBreakTime => baseBeatmap.TotalBreakTime;
diff --git a/osu.Game/Screens/Edit/EditorBeatmap.cs b/osu.Game/Screens/Edit/EditorBeatmap.cs
index ae0fd9130f..331da51888 100644
--- a/osu.Game/Screens/Edit/EditorBeatmap.cs
+++ b/osu.Game/Screens/Edit/EditorBeatmap.cs
@@ -172,7 +172,11 @@ namespace osu.Game.Screens.Edit
             set => PlayableBeatmap.ControlPointInfo = value;
         }
 
-        public BindableList<BreakPeriod> Breaks => PlayableBeatmap.Breaks;
+        public BindableList<BreakPeriod> Breaks
+        {
+            get => PlayableBeatmap.Breaks;
+            set => PlayableBeatmap.Breaks = value;
+        }
 
         public List<string> UnhandledEventLines => PlayableBeatmap.UnhandledEventLines;