Set slide as not in use when using cheat to remove guests

distribution/changelog.txt

@@ -27,6 +27,7 @@
 - Fix: [#25380] The Lay-down Roller Coaster left corkscrew supports are incorrect at one angle (original bug).
 - Fix: [#25388] The Shortcut Keys window uses the wrong colours for separators, scrollbars and buttons.
 - Fix: [#25401] Mazes can be built 2 units higher than their support limits.
+- Fix: [#25404] Guests that have been removed with the remove all guests cheat will still be visible if they were sliding down the Spiral Slide.
 
 0.4.27 (2025-10-04)
 ------------------------------------------------------------------------

src/openrct2/actions/CheatSetAction.cpp

@@ -721,6 +721,7 @@ namespace OpenRCT2::GameActions
         for (auto& ride : RideManager(gameState))
         {
             ride.numRiders = 0;
+            ride.slideInUse = 0;
 
             for (auto& station : ride.getStations())
             {

src/openrct2/network/NetworkBase.cpp

@@ -47,7 +47,7 @@
 // It is used for making sure only compatible builds get connected, even within
 // single OpenRCT2 version.
 
-constexpr uint8_t kStreamVersion = 4;
+constexpr uint8_t kStreamVersion = 5;
 
 const std::string kStreamID = std::string(kOpenRCT2Version) + "-" + std::to_string(kStreamVersion);