diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 0da1f9636b..2a3b2fd978 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -50,6 +50,48 @@ jobs:
           name: osu-test-results-${{matrix.os.prettyname}}-${{matrix.threadingMode}}
           path: ${{github.workspace}}/TestResults/TestResults-${{matrix.os.prettyname}}-${{matrix.threadingMode}}.trx
 
+  build-only-android:
+    name: Build only (Android)
+    runs-on: windows-latest
+    timeout-minutes: 60
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Install .NET 5.0.x
+        uses: actions/setup-dotnet@v1
+        with:
+          dotnet-version: "5.0.x"
+
+      - name: Setup MSBuild
+        uses: microsoft/setup-msbuild@v1
+
+      - name: Build
+        run: msbuild osu.Android.slnf /restore /p:Configuration=Debug
+
+  build-only-ios:
+    # While this workflow technically *can* run, it fails as iOS builds are blocked by multiple issues.
+    # See https://github.com/ppy/osu-framework/issues/4677 for the details.
+    # The job can be unblocked once those issues are resolved and game deployments can happen again.
+    if: false
+    name: Build only (iOS)
+    runs-on: macos-latest
+    timeout-minutes: 60
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Install .NET 5.0.x
+        uses: actions/setup-dotnet@v1
+        with:
+          dotnet-version: "5.0.x"
+
+      # Contrary to seemingly any other msbuild, msbuild running on macOS/Mono
+      # cannot accept .sln(f) files as arguments.
+      # Build just the main game for now.
+      - name: Build
+        run: msbuild osu.iOS/osu.iOS.csproj /restore /p:Configuration=Debug
+
   inspect-code:
     name: Code Quality
     runs-on: ubuntu-latest
diff --git a/osu.Game.Tests/Visual/Online/TestSceneChatOverlay.cs b/osu.Game.Tests/Visual/Online/TestSceneChatOverlay.cs
index 9562b41363..ab4e1b4457 100644
--- a/osu.Game.Tests/Visual/Online/TestSceneChatOverlay.cs
+++ b/osu.Game.Tests/Visual/Online/TestSceneChatOverlay.cs
@@ -4,6 +4,7 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
+using System.Net;
 using JetBrains.Annotations;
 using NUnit.Framework;
 using osu.Framework.Allocation;
@@ -105,7 +106,7 @@ namespace osu.Game.Tests.Visual.Online
                             }
                             else
                             {
-                                getUser.TriggerFailure(new Exception());
+                                getUser.TriggerFailure(new WebException());
                             }
 
                             return true;
diff --git a/osu.Game/Beatmaps/BeatmapSetInfo.cs b/osu.Game/Beatmaps/BeatmapSetInfo.cs
index 79cd8253f7..0c032e1482 100644
--- a/osu.Game/Beatmaps/BeatmapSetInfo.cs
+++ b/osu.Game/Beatmaps/BeatmapSetInfo.cs
@@ -117,7 +117,6 @@ namespace osu.Game.Beatmaps
         [JsonIgnore]
         public DateTimeOffset? LastUpdated => OnlineInfo.LastUpdated;
 
-        [NotMapped]
         [JsonIgnore]
         public BeatmapSetOnlineStatus Status { get; set; } = BeatmapSetOnlineStatus.None;
 
diff --git a/osu.Game/Online/API/Requests/Responses/APIBeatmap.cs b/osu.Game/Online/API/Requests/Responses/APIBeatmap.cs
index 6e43ac5504..fee3e56859 100644
--- a/osu.Game/Online/API/Requests/Responses/APIBeatmap.cs
+++ b/osu.Game/Online/API/Requests/Responses/APIBeatmap.cs
@@ -54,7 +54,7 @@ namespace osu.Game.Online.API.Requests.Responses
         [JsonProperty(@"accuracy")]
         private float overallDifficulty { get; set; }
 
-        public double Length => lengthInSeconds * 1000;
+        public double Length => TimeSpan.FromSeconds(lengthInSeconds).TotalMilliseconds;
 
         [JsonProperty(@"total_length")]
         private double lengthInSeconds { get; set; }
@@ -86,7 +86,7 @@ namespace osu.Game.Online.API.Requests.Responses
                 OnlineBeatmapID = OnlineID,
                 Version = DifficultyName,
                 // this is actually an incorrect mapping (Length is calculated as drain length in lazer's import process, see BeatmapManager.calculateLength).
-                Length = TimeSpan.FromSeconds(Length).TotalMilliseconds,
+                Length = Length,
                 Status = Status,
                 MD5Hash = Checksum,
                 BeatmapSet = set,