diff --git a/osu.Game.Tests/Visual/Editing/TestSceneEditorSaving.cs b/osu.Game.Tests/Visual/Editing/TestSceneEditorSaving.cs
index f4e704b22b..f0aa3e2350 100644
--- a/osu.Game.Tests/Visual/Editing/TestSceneEditorSaving.cs
+++ b/osu.Game.Tests/Visual/Editing/TestSceneEditorSaving.cs
@@ -32,6 +32,8 @@ namespace osu.Game.Tests.Visual.Editing
 
             AddUntilStep("wait for editor load", () => editor != null);
 
+            AddStep("Set overall difficulty", () => editorBeatmap.Difficulty.OverallDifficulty = 7);
+
             AddStep("Add timing point", () => editorBeatmap.ControlPointInfo.Add(0, new TimingControlPoint()));
 
             AddStep("Enter compose mode", () => InputManager.Key(Key.F1));
@@ -57,6 +59,7 @@ namespace osu.Game.Tests.Visual.Editing
 
             AddUntilStep("Wait for editor load", () => editor != null);
             AddAssert("Beatmap contains single hitcircle", () => editorBeatmap.HitObjects.Count == 1);
+            AddAssert("Beatmap has correct overall difficulty", () => editorBeatmap.Difficulty.OverallDifficulty == 7);
         }
     }
 }
diff --git a/osu.Game/Beatmaps/BeatmapConverter.cs b/osu.Game/Beatmaps/BeatmapConverter.cs
index f3434c5153..627e54c803 100644
--- a/osu.Game/Beatmaps/BeatmapConverter.cs
+++ b/osu.Game/Beatmaps/BeatmapConverter.cs
@@ -40,7 +40,13 @@ namespace osu.Game.Beatmaps
         public IBeatmap Convert(CancellationToken cancellationToken = default)
         {
             // We always operate on a clone of the original beatmap, to not modify it game-wide
-            return ConvertBeatmap(Beatmap.Clone(), cancellationToken);
+            var original = Beatmap.Clone();
+
+            // Shallow clone isn't enough to ensure we don't mutate beatmap info unexpectedly.
+            // Can potentially be removed after `Beatmap.Difficulty` doesn't save back to `Beatmap.BeatmapInfo`.
+            original.BeatmapInfo = original.BeatmapInfo.Clone();
+
+            return ConvertBeatmap(original, cancellationToken);
         }
 
         /// <summary>
diff --git a/osu.Game/Tests/Beatmaps/BeatmapConversionTest.cs b/osu.Game/Tests/Beatmaps/BeatmapConversionTest.cs
index 64f1ee4a7a..6d63525011 100644
--- a/osu.Game/Tests/Beatmaps/BeatmapConversionTest.cs
+++ b/osu.Game/Tests/Beatmaps/BeatmapConversionTest.cs
@@ -14,6 +14,7 @@ using osu.Framework.Graphics.Textures;
 using osu.Game.Beatmaps;
 using osu.Game.Beatmaps.Formats;
 using osu.Game.IO;
+using osu.Game.IO.Serialization;
 using osu.Game.Rulesets;
 using osu.Game.Rulesets.Mods;
 using osu.Game.Rulesets.Objects;
@@ -109,6 +110,8 @@ namespace osu.Game.Tests.Beatmaps
         {
             var beatmap = GetBeatmap(name);
 
+            string beforeConversion = beatmap.Serialize();
+
             var converterResult = new Dictionary<HitObject, IEnumerable<HitObject>>();
 
             var working = new ConversionWorkingBeatmap(beatmap)
@@ -122,6 +125,10 @@ namespace osu.Game.Tests.Beatmaps
 
             working.GetPlayableBeatmap(CreateRuleset().RulesetInfo, mods);
 
+            string afterConversion = beatmap.Serialize();
+
+            Assert.AreEqual(beforeConversion, afterConversion, "Conversion altered original beatmap");
+
             return new ConvertResult
             {
                 Mappings = converterResult.Select(r =>