diff --git a/distribution/changelog.txt b/distribution/changelog.txt
index 90d8c19242..2002fe766d 100644
--- a/distribution/changelog.txt
+++ b/distribution/changelog.txt
@@ -19,6 +19,7 @@
 - Fix: [#11071, #22958] The virtual floor does not always draw correctly.
 - Fix: [#18220] Some custom RCT1 scenarios are detected as competition DLC scenarios.
 - Fix: [#20158] Custom animated scenery .DATs with frame offsets draw a random sprite at the end of their animation.
+- Fix: [#22628] Potential crash while rebuilding the scenario index.
 - Fix: [#23289] Dodgems and Flying Saucer cars can spawn on top of each other when the ride is opened.
 - Fix: [#24332] Banner font renders differently when using RCT Classic as the base game.
 - Fix: [#24346] Possible crash during line drawing in OpenGL mode.
diff --git a/src/openrct2/object/ObjectManager.cpp b/src/openrct2/object/ObjectManager.cpp
index 9004e87eb0..6309e330e6 100644
--- a/src/openrct2/object/ObjectManager.cpp
+++ b/src/openrct2/object/ObjectManager.cpp
@@ -163,6 +163,21 @@ public:
         return objectList;
     }
 
+    std::unique_ptr<Object> LoadTempObject(std::string_view id) override
+    {
+        const ObjectRepositoryItem* ori = _objectRepository.FindObject(id);
+        if (ori == nullptr)
+        {
+            LOG_ERROR("Object '%s' not found in repository.", std::string{ id }.c_str());
+            return nullptr;
+        }
+
+        auto object = _objectRepository.LoadObject(ori);
+        object->Load();
+
+        return object;
+    }
+
     Object* LoadObject(std::string_view identifier) override
     {
         const ObjectRepositoryItem* ori = _objectRepository.FindObject(identifier);
diff --git a/src/openrct2/object/ObjectManager.h b/src/openrct2/object/ObjectManager.h
index 2a8a0dbff5..168ddd37e5 100644
--- a/src/openrct2/object/ObjectManager.h
+++ b/src/openrct2/object/ObjectManager.h
@@ -37,6 +37,7 @@ struct IObjectManager
     virtual ObjectEntryIndex GetLoadedObjectEntryIndex(const Object* object) = 0;
     virtual ObjectList GetLoadedObjects() = 0;
 
+    virtual std::unique_ptr<Object> LoadTempObject(std::string_view identifier) = 0;
     virtual Object* LoadObject(std::string_view identifier) = 0;
     virtual Object* LoadObject(const RCTObjectEntry* entry) = 0;
     virtual Object* LoadObject(const ObjectEntryDescriptor& descriptor) = 0;
diff --git a/src/openrct2/rct1/S4Importer.cpp b/src/openrct2/rct1/S4Importer.cpp
index f64053999c..c6a68bb82a 100644
--- a/src/openrct2/rct1/S4Importer.cpp
+++ b/src/openrct2/rct1/S4Importer.cpp
@@ -96,8 +96,6 @@ static constexpr ObjectEntryIndex ObjectEntryIndexIgnore = 254;
 
 namespace OpenRCT2::RCT1
 {
-    static std::mutex mtx;
-
     class S4Importer final : public IParkImporter
     {
     private:
@@ -272,19 +270,14 @@ namespace OpenRCT2::RCT1
             {
                 auto& objManager = GetContext()->GetObjectManager();
 
-                // Ensure only one thread talks to the object manager at a time
-                std::lock_guard lock(mtx);
-
-                // Unload loaded scenario text object, if any.
-                if (auto* obj = objManager.GetLoadedObject<ScenarioTextObject>(0); obj != nullptr)
-                    objManager.UnloadObjects({ obj->GetDescriptor() });
-
                 // Load the one specified
-                if (auto* obj = objManager.LoadObject(desc.textObjectId); obj != nullptr)
+                if (auto obj = objManager.LoadTempObject(desc.textObjectId); obj != nullptr)
                 {
-                    auto* textObject = reinterpret_cast<ScenarioTextObject*>(obj);
-                    name = textObject->GetScenarioName();
-                    details = textObject->GetScenarioDetails();
+                    auto& textObject = reinterpret_cast<ScenarioTextObject&>(*obj);
+                    name = textObject.GetScenarioName();
+                    details = textObject.GetScenarioDetails();
+
+                    obj->Unload();
                 }
             }
 
@@ -2415,20 +2408,13 @@ namespace OpenRCT2::RCT1
                 {
                     auto& objManager = GetContext()->GetObjectManager();
 
-                    // Ensure only one thread talks to the object manager at a time
-                    std::lock_guard lock(mtx);
-
-                    // Unload loaded scenario text object, if any.
-                    if (auto* obj = objManager.GetLoadedObject<ScenarioTextObject>(0); obj != nullptr)
-                        objManager.UnloadObjects({ obj->GetDescriptor() });
-
                     // Load the one specified
-                    if (auto* obj = objManager.LoadObject(desc.textObjectId); obj != nullptr)
+                    if (auto obj = objManager.LoadTempObject(desc.textObjectId); obj != nullptr)
                     {
-                        auto* textObject = reinterpret_cast<ScenarioTextObject*>(obj);
-                        name = textObject->GetScenarioName();
-                        parkName = textObject->GetParkName();
-                        details = textObject->GetScenarioDetails();
+                        auto& textObject = reinterpret_cast<ScenarioTextObject&>(*obj);
+                        name = textObject.GetScenarioName();
+                        parkName = textObject.GetParkName();
+                        details = textObject.GetScenarioDetails();
                     }
                 }
             }
diff --git a/src/openrct2/rct2/S6Importer.cpp b/src/openrct2/rct2/S6Importer.cpp
index 183d1f659e..b8f8e16f87 100644
--- a/src/openrct2/rct2/S6Importer.cpp
+++ b/src/openrct2/rct2/S6Importer.cpp
@@ -95,8 +95,6 @@ namespace OpenRCT2::RCT2
 {
 #define DECRYPT_MONEY(money) (static_cast<money32>(Numerics::rol32((money) ^ 0xF4EC9621, 13)))
 
-    static std::mutex mtx;
-
     /**
      * Class to import RollerCoaster Tycoon 2 scenarios (*.SC6) and saved games (*.SV6).
      */
@@ -298,19 +296,14 @@ namespace OpenRCT2::RCT2
             {
                 auto& objManager = GetContext()->GetObjectManager();
 
-                // Ensure only one thread talks to the object manager at a time
-                std::lock_guard lock(mtx);
-
-                // Unload loaded scenario text object, if any.
-                if (auto* obj = objManager.GetLoadedObject<ScenarioTextObject>(0); obj != nullptr)
-                    objManager.UnloadObjects({ obj->GetDescriptor() });
-
                 // Load the one specified
-                if (auto* obj = objManager.LoadObject(desc.textObjectId); obj != nullptr)
+                if (auto obj = objManager.LoadTempObject(desc.textObjectId); obj != nullptr)
                 {
-                    auto* textObject = reinterpret_cast<ScenarioTextObject*>(obj);
-                    dst->Name = textObject->GetScenarioName();
-                    dst->Details = textObject->GetScenarioDetails();
+                    auto& textObject = reinterpret_cast<ScenarioTextObject&>(*obj);
+                    dst->Name = textObject.GetScenarioName();
+                    dst->Details = textObject.GetScenarioDetails();
+
+                    obj->Unload();
                 }
             }