diff --git a/src/openrct2/park/ParkFile.cpp b/src/openrct2/park/ParkFile.cpp
index d964800b4c..5be5e18ff8 100644
--- a/src/openrct2/park/ParkFile.cpp
+++ b/src/openrct2/park/ParkFile.cpp
@@ -982,7 +982,7 @@ namespace OpenRCT2
 
             auto found = os.ReadWriteChunk(
                 ParkFileChunkType::TILES,
-                [pathToSurfaceMap, pathToQueueSurfaceMap, pathToRailingsMap](OrcaStream::ChunkStream& cs) {
+                [pathToSurfaceMap, pathToQueueSurfaceMap, pathToRailingsMap, &os](OrcaStream::ChunkStream& cs) {
                     cs.ReadWrite(gMapSize.x);
                     cs.ReadWrite(gMapSize.y);
 
@@ -1018,6 +1018,16 @@ namespace OpenRCT2
                                         }
                                     }
                                 }
+                                else if (it.element->GetType() == TileElementType::Track)
+                                {
+                                    auto* trackElement = it.element->AsTrack();
+                                    if (TrackTypeMustBeMadeInvisible(
+                                            trackElement->GetRideType(), trackElement->GetTrackType(),
+                                            os.GetHeader().TargetVersion))
+                                    {
+                                        it.element->SetInvisible(true);
+                                    }
+                                }
                             }
                         }
                         ParkEntranceUpdateLocations();
diff --git a/src/openrct2/park/ParkFile.h b/src/openrct2/park/ParkFile.h
index 5594368119..7df5ab0959 100644
--- a/src/openrct2/park/ParkFile.h
+++ b/src/openrct2/park/ParkFile.h
@@ -8,7 +8,7 @@ struct ObjectRepositoryItem;
 namespace OpenRCT2
 {
     // Current version that is saved.
-    constexpr uint32_t PARK_FILE_CURRENT_VERSION = 15;
+    constexpr uint32_t PARK_FILE_CURRENT_VERSION = 16;
 
     // The minimum version that is forwards compatible with the current version.
     constexpr uint32_t PARK_FILE_MIN_VERSION = 14;
diff --git a/src/openrct2/rct1/S4Importer.cpp b/src/openrct2/rct1/S4Importer.cpp
index 7496e1228f..2e608ada20 100644
--- a/src/openrct2/rct1/S4Importer.cpp
+++ b/src/openrct2/rct1/S4Importer.cpp
@@ -1692,6 +1692,11 @@ namespace RCT1
                         dst2->SetMazeEntry(src2->GetMazeEntry());
                     }
 
+                    if (TrackTypeMustBeMadeInvisible(rideType, trackType))
+                    {
+                        dst->SetInvisible(true);
+                    }
+
                     return 1;
                 }
                 case TileElementType::SmallScenery:
diff --git a/src/openrct2/rct2/S6Importer.cpp b/src/openrct2/rct2/S6Importer.cpp
index 3d0a27d4ba..1ab1bf8d4b 100644
--- a/src/openrct2/rct2/S6Importer.cpp
+++ b/src/openrct2/rct2/S6Importer.cpp
@@ -1442,6 +1442,11 @@ namespace RCT2
                         dst2->SetSeatRotation(src2->GetSeatRotation());
                     }
 
+                    if (TrackTypeMustBeMadeInvisible(rideType, dst2->GetTrackType()))
+                    {
+                        dst->SetInvisible(true);
+                    }
+
                     break;
                 }
                 case RCT12TileElementType::SmallScenery:
diff --git a/src/openrct2/ride/Track.cpp b/src/openrct2/ride/Track.cpp
index ffa318575f..6652a7c073 100644
--- a/src/openrct2/ride/Track.cpp
+++ b/src/openrct2/ride/Track.cpp
@@ -918,3 +918,20 @@ void TrackElement::SetHighlight(bool on)
     if (on)
         Flags2 |= TRACK_ELEMENT_FLAGS2_HIGHLIGHT;
 }
+
+bool TrackTypeMustBeMadeInvisible(ride_type_t rideType, track_type_t trackType, int32_t parkFileVersion)
+{
+    // Lots of Log Flumes exist where the downward slopes are simulated by using other track
+    // types like the Splash Boats, but not actually made invisible, because they never needed
+    // to be.
+    if (rideType == RIDE_TYPE_LOG_FLUME && parkFileVersion <= 15)
+    {
+        if (trackType == TrackElemType::Down25ToDown60 || trackType == TrackElemType::Down60
+            || trackType == TrackElemType::Down60ToDown25)
+        {
+            return true;
+        }
+    }
+
+    return false;
+}
diff --git a/src/openrct2/ride/Track.h b/src/openrct2/ride/Track.h
index bfaa6f8f17..c8fd0f4e6b 100644
--- a/src/openrct2/ride/Track.h
+++ b/src/openrct2/ride/Track.h
@@ -634,3 +634,16 @@ ResultWithMessage track_remove_station_element(const CoordsXYZD& loc, RideId rid
 
 bool TrackTypeHasSpeedSetting(track_type_t trackType);
 std::optional<CoordsXYZD> GetTrackSegmentOrigin(const CoordsXYE& posEl);
+
+/**
+ * If new pieces get added to existing ride types, this could cause existing parks to change appearance,
+ * since the formerly unrendered pieces were not explicitly set invisible.
+ * To avoid this, this function will return true if the piece is question was added after the park was created,
+ * so that import code can properly set the visibility.
+ *
+ * @param rideType The OpenRCT2 ride type
+ * @param trackType The OpenRCT2 track type
+ * @param parkFileVersion The current park file version. Pass -1 when converting S4 or S6.
+ * @return
+ */
+bool TrackTypeMustBeMadeInvisible(ride_type_t rideType, track_type_t trackType, int32_t parkFileVersion = -1);