update detaching state

42.13/media/lua/client/TowBar/TowingHooking.lua

@@ -304,6 +304,12 @@ function TowBarMod.Hook.hasTowBarTowData(vehicle)
     return modData and modData["isTowingByTowBar"] and modData["towed"]
 end
 
+function TowBarMod.Hook.isTowBarLinkActive(towingVehicle, towedVehicle)
+    if not towingVehicle or not towedVehicle then return false end
+    return towingVehicle:getVehicleTowing() == towedVehicle
+        and towedVehicle:getVehicleTowedBy() == towingVehicle
+end
+
 function TowBarMod.Hook.queueTowBarReapply(vehicle)
     if not TowBarMod.Hook.hasTowBarTowData(vehicle) then return end
     local vehicleId = vehicle:getId()
@@ -311,24 +317,40 @@ function TowBarMod.Hook.queueTowBarReapply(vehicle)
 end
 
 function TowBarMod.Hook.tryTowBarReapply(vehicle, playerObj)
-    if not TowBarMod.Hook.hasTowBarTowData(vehicle) then return false end
+    if not TowBarMod.Hook.hasTowBarTowData(vehicle) then
+        if vehicle then
+            TowBarMod.Hook.pendingReapplyVehicleIds[vehicle:getId()] = nil
+        end
+        return false
+    end
+
     local vehicleId = vehicle:getId()
-    if TowBarMod.Hook.reappliedVehicleIds[vehicleId] then return true end
+    if TowBarMod.Hook.reappliedVehicleIds[vehicleId] then
+        TowBarMod.Hook.pendingReapplyVehicleIds[vehicleId] = nil
+        return true
+    end
 
     local towingVehicle = vehicle:getVehicleTowedBy()
     if not towingVehicle then return false end
     local towingModData = towingVehicle:getModData()
     if not towingModData or towingModData["isTowingByTowBar"] ~= true then return false end
 
-    playerObj = playerObj or getPlayer()
-    if not playerObj then return false end
-
     local modData = vehicle:getModData()
     if not modData.towBarOriginalScriptName then
         modData.towBarOriginalScriptName = vehicle:getScriptName()
         vehicle:transmitModData()
     end
 
+    -- Save/load already restores a valid tow link. Do not stack another attach on top.
+    if TowBarMod.Hook.isTowBarLinkActive(towingVehicle, vehicle) then
+        TowBarMod.Hook.setVehiclePostAttach(playerObj, vehicle)
+        TowBarMod.Hook.markReapplied(vehicle)
+        return true
+    end
+
+    playerObj = playerObj or getPlayer()
+    if not playerObj then return false end
+
     local attachmentA = towingVehicle:getTowAttachmentSelf() or "trailer"
     local attachmentB = vehicle:getTowAttachmentSelf() or "trailerfront"
 
@@ -359,12 +381,17 @@ function TowBarMod.Hook.processPendingReapplies()
     local playerObj = getPlayer()
     if not playerObj then return end
 
+    local resolvedVehicleIds = {}
     for vehicleId, _ in pairs(TowBarMod.Hook.pendingReapplyVehicleIds) do
         local vehicle = TowBarMod.Hook.getVehicleByIdSafe(vehicleId)
-        if vehicle then
-            TowBarMod.Hook.tryTowBarReapply(vehicle, playerObj)
+        if vehicle and (TowBarMod.Hook.tryTowBarReapply(vehicle, playerObj) or not TowBarMod.Hook.hasTowBarTowData(vehicle)) then
+            table.insert(resolvedVehicleIds, vehicleId)
         end
     end
+
+    for _, vehicleId in ipairs(resolvedVehicleIds) do
+        TowBarMod.Hook.pendingReapplyVehicleIds[vehicleId] = nil
+    end
 end
 
 function TowBarMod.Hook.OnSpawnVehicle(vehicle)
@@ -468,8 +495,9 @@ end
 function TowBarMod.Hook.performDeattachTowBar(playerObj, towingVehicle, towedVehicle)
     TowBarMod.Utils.updateAttachmentsOnDefaultValues(towingVehicle, towedVehicle)
 
-    local args = { vehicle = towedVehicle:getId() }
-    sendClientCommand(playerObj, "towbar", "detachConstraint", args)
+    -- Detach from the towing side to mirror vanilla trailer detach behavior.
+    local args = { vehicle = towingVehicle:getId() }
+    sendClientCommand(playerObj, "vehicle", "detachTrailer", args)
 
     local towedModData = towedVehicle:getModData()
     if towedModData.towBarOriginalScriptName then