diff --git a/src/openrct2-ui/scripting/CustomWindow.cpp b/src/openrct2-ui/scripting/CustomWindow.cpp
index 64c5d0a7ab..02be8e0683 100644
--- a/src/openrct2-ui/scripting/CustomWindow.cpp
+++ b/src/openrct2-ui/scripting/CustomWindow.cpp
@@ -390,28 +390,32 @@ namespace OpenRCT2::Ui::Windows
     public:
         CustomWindow(std::shared_ptr<Plugin> owner, const CustomWindowDesc& desc)
             : _info(owner, desc)
+        {
+        }
+
+        void OnOpen() override
         {
             number = GetNewWindowNumber();
 
             // Set window tab
-            page = desc.TabIndex.value_or(0);
+            page = _info.Desc.TabIndex.value_or(0);
 
             // Set window colours
             colours[0] = COLOUR_GREY;
             colours[1] = COLOUR_GREY;
             colours[2] = COLOUR_GREY;
-            auto numColours = std::min(std::size(colours), std::size(desc.Colours));
+            auto numColours = std::min(std::size(colours), std::size(_info.Desc.Colours));
             for (size_t i = 0; i < numColours; i++)
             {
-                colours[i] = desc.Colours[i];
+                colours[i] = _info.Desc.Colours[i];
             }
 
-            if (desc.IsResizable())
+            if (_info.Desc.IsResizable())
             {
-                min_width = desc.MinWidth.value_or(0);
-                min_height = desc.MinHeight.value_or(0);
-                max_width = desc.MaxWidth.value_or(std::numeric_limits<uint16_t>::max());
-                max_height = desc.MaxHeight.value_or(std::numeric_limits<uint16_t>::max());
+                min_width = _info.Desc.MinWidth.value_or(0);
+                min_height = _info.Desc.MinHeight.value_or(0);
+                max_width = _info.Desc.MaxWidth.value_or(std::numeric_limits<uint16_t>::max());
+                max_height = _info.Desc.MaxHeight.value_or(std::numeric_limits<uint16_t>::max());
             }
             RefreshWidgets();
         }
diff --git a/src/openrct2-ui/windows/LoadSave.cpp b/src/openrct2-ui/windows/LoadSave.cpp
index ac49ba3b02..ab81837f1a 100644
--- a/src/openrct2-ui/windows/LoadSave.cpp
+++ b/src/openrct2-ui/windows/LoadSave.cpp
@@ -492,33 +492,15 @@ static u8string OpenSystemFileBrowser(bool isSave)
 class LoadSaveWindow final : public Window
 {
 public:
-    LoadSaveWindow(int32_t type)
+    LoadSaveWindow(int32_t loadSaveType)
+        : type(loadSaveType)
     {
-        widgets = window_loadsave_widgets;
-
-        const auto uiContext = OpenRCT2::GetContext()->GetUiContext();
-        if (!uiContext->HasFilePicker())
-        {
-            disabled_widgets |= (1uLL << WIDX_BROWSE);
-            window_loadsave_widgets[WIDX_BROWSE].type = WindowWidgetType::Empty;
-        }
-
-        // TODO: Split LOADSAVETYPE_* into two proper enum classes (one for load/save, the other for the type)
-        const bool isSave = (type & 0x01) == LOADSAVETYPE_SAVE;
-        const auto path = GetDir(type);
-
-        const char* pattern = GetFilterPatternByType(type, isSave);
-        PopulateList(isSave, path, pattern);
-        no_list_items = static_cast<uint16_t>(_listItems.size());
-        selected_list_item = -1;
-
-        InitScrollWidgets();
-        ComputeMaxDateWidth();
     }
 
 private:
     int32_t maxDateWidth{ 0 };
     int32_t maxTimeWidth{ 0 };
+    int32_t type;
 
 public:
     void PopulateList(int32_t includeNewItem, const u8string& directory, std::string_view extensionPattern)
@@ -692,6 +674,26 @@ public:
 public:
     void OnOpen() override
     {
+        widgets = window_loadsave_widgets;
+
+        const auto uiContext = OpenRCT2::GetContext()->GetUiContext();
+        if (!uiContext->HasFilePicker())
+        {
+            disabled_widgets |= (1uLL << WIDX_BROWSE);
+            window_loadsave_widgets[WIDX_BROWSE].type = WindowWidgetType::Empty;
+        }
+
+        // TODO: Split LOADSAVETYPE_* into two proper enum classes (one for load/save, the other for the type)
+        const bool isSave = (type & 0x01) == LOADSAVETYPE_SAVE;
+        const auto path = GetDir(type);
+
+        const char* pattern = GetFilterPatternByType(type, isSave);
+        PopulateList(isSave, path, pattern);
+        no_list_items = static_cast<uint16_t>(_listItems.size());
+        selected_list_item = -1;
+
+        InitScrollWidgets();
+        ComputeMaxDateWidth();
         min_width = WW;
         min_height = WH / 2;
         max_width = WW * 2;
@@ -1120,6 +1122,10 @@ public:
     OverwritePromptWindow(const std::string_view name, const std::string_view path)
         : _name(name)
         , _path(path)
+    {
+    }
+
+    void OnOpen() override
     {
         widgets = window_overwrite_prompt_widgets;
         colours[0] = TRANSLUCENT(COLOUR_BORDEAUX_RED);
diff --git a/src/openrct2-ui/windows/MapTooltip.cpp b/src/openrct2-ui/windows/MapTooltip.cpp
index 956edaf039..11d9301d04 100644
--- a/src/openrct2-ui/windows/MapTooltip.cpp
+++ b/src/openrct2-ui/windows/MapTooltip.cpp
@@ -36,7 +36,7 @@ static Formatter _mapTooltipArgs;
 class MapTooltip final : public Window
 {
 public:
-    MapTooltip()
+    void OnOpen() override
     {
         widgets = window_map_tooltip_widgets;
     }
diff --git a/src/openrct2-ui/windows/Multiplayer.cpp b/src/openrct2-ui/windows/Multiplayer.cpp
index d7012d934f..da54367110 100644
--- a/src/openrct2-ui/windows/Multiplayer.cpp
+++ b/src/openrct2-ui/windows/Multiplayer.cpp
@@ -161,7 +161,7 @@ private:
     ScreenCoordsXY InformationGetSize();
 
 public:
-    MultiplayerWindow();
+    void OnOpen() override;
 
     void SetPage(int32_t page_number);
 
@@ -193,7 +193,7 @@ WindowBase* WindowMultiplayerOpen()
     return window;
 }
 
-MultiplayerWindow::MultiplayerWindow()
+void MultiplayerWindow::OnOpen()
 {
     SetPage(WINDOW_MULTIPLAYER_PAGE_INFORMATION);
 }
diff --git a/src/openrct2-ui/windows/Research.cpp b/src/openrct2-ui/windows/Research.cpp
index ea490fc18d..43a0576f3a 100644
--- a/src/openrct2-ui/windows/Research.cpp
+++ b/src/openrct2-ui/windows/Research.cpp
@@ -116,11 +116,12 @@ static constexpr StringId ResearchStageNames[] = {
 class ResearchWindow final : public Window
 {
 public:
-    ResearchWindow()
+    void OnOpen() override
     {
         widgets = window_research_page_widgets[WINDOW_RESEARCH_PAGE_DEVELOPMENT];
         width = WW_DEVELOPMENT;
         height = WH_DEVELOPMENT;
+        ResearchUpdateUncompletedTypes();
     }
 
     void SetPage(int32_t newPageIndex)
@@ -152,11 +153,6 @@ public:
     }
 
 private:
-    void OnOpen() override
-    {
-        ResearchUpdateUncompletedTypes();
-    }
-
     void OnUpdate() override
     {
         // Tab animation
diff --git a/src/openrct2-ui/windows/Ride.cpp b/src/openrct2-ui/windows/Ride.cpp
index 6f9f484891..b94e878897 100644
--- a/src/openrct2-ui/windows/Ride.cpp
+++ b/src/openrct2-ui/windows/Ride.cpp
@@ -635,6 +635,10 @@ public:
     RideWindow(const Ride& ride)
     {
         rideId = ride.id;
+    }
+
+    virtual void OnOpen() override
+    {
         widgets = PageWidgets[WINDOW_RIDE_PAGE_MAIN];
         hold_down_widgets = PageHoldDownWidgets[WINDOW_RIDE_PAGE_MAIN];
 
@@ -648,9 +652,15 @@ public:
         max_width = 500;
         max_height = 450;
 
-        UpdateOverallView(ride);
+        auto ride = GetRide(rideId);
+        if (ride == nullptr)
+        {
+            Close();
+            return;
+        }
+        UpdateOverallView(*ride);
 
-        PopulateVehicleTypeDropdown(ride, true);
+        PopulateVehicleTypeDropdown(*ride, true);
     }
 
     virtual void OnClose() override