diff --git a/rts/Game/UI/KeyBindings.cpp b/rts/Game/UI/KeyBindings.cpp
index 9bafd6ca54..4dd9e09711 100644
--- a/rts/Game/UI/KeyBindings.cpp
+++ b/rts/Game/UI/KeyBindings.cpp
@@ -740,7 +740,13 @@ bool CKeyBindings::UnBindAction(const std::string& command)
 	RECOIL_DETAILED_TRACY_ZONE;
 	if (debugEnabled)
 		LOG("[CKeyBindings::%s] command=%s", __func__, command.c_str());
-	return RemoveActionFromKeyMap(command, codeBindings) || RemoveActionFromKeyMap(command, scanBindings);
+
+	// clear both maps; || would short-circuit and leave the scancode binding when
+	// the action is also bound to a keycode
+	const bool removedFromCode = RemoveActionFromKeyMap(command, codeBindings);
+	const bool removedFromScan = RemoveActionFromKeyMap(command, scanBindings);
+
+	return removedFromCode || removedFromScan;
 }
 
 
diff --git a/rts/Lua/LuaParser.cpp b/rts/Lua/LuaParser.cpp
index 45c44ebf9e..6ca8394fc4 100644
--- a/rts/Lua/LuaParser.cpp
+++ b/rts/Lua/LuaParser.cpp
@@ -501,12 +501,13 @@ void LuaParser::AddString(int key, const std::string& value)
 
 int LuaParser::TimeCheck(lua_State* L)
 {
-	#if (!defined(UNITSYNC) && !defined(DEDICATED))
 	if (!lua_isstring(L, 1) || !lua_isfunction(L, 2))
 		luaL_error(L, "Invalid arguments to TimeCheck('string', func, ...)");
 
 	{
+		#if (!defined(UNITSYNC) && !defined(DEDICATED))
 		ScopedOnceTimer timer(lua_tostring(L, 1));
+		#endif
 
 		lua_remove(L, 1);
 
@@ -519,9 +520,6 @@ int LuaParser::TimeCheck(lua_State* L)
 	}
 
 	return lua_gettop(L);
-	#else
-	return 0;
-	#endif
 }
 
 
diff --git a/rts/Lua/LuaUnsyncedCtrl.cpp b/rts/Lua/LuaUnsyncedCtrl.cpp
index 8156e83f52..2079d9724c 100644
--- a/rts/Lua/LuaUnsyncedCtrl.cpp
+++ b/rts/Lua/LuaUnsyncedCtrl.cpp
@@ -2150,8 +2150,7 @@ int LuaUnsyncedCtrl::SetSkyBoxTexture(lua_State* L)
 	if (CLuaHandle::GetHandleSynced(L))
 		return 0;
 
-	if (const auto& sky = ISky::GetSky(); sky != nullptr)
-		sky->SetLuaTexture(ParseLuaTextureData(L, false));
+	ISky::SetSkyLuaTexture(ParseLuaTextureData(L, false));
 
 	return 0;
 }
diff --git a/rts/Rendering/Env/ISky.cpp b/rts/Rendering/Env/ISky.cpp
index 1e44ecabeb..b662d8293e 100644
--- a/rts/Rendering/Env/ISky.cpp
+++ b/rts/Rendering/Env/ISky.cpp
@@ -89,6 +89,30 @@ void ISky::SetSky()
 	}
 }
 
+void ISky::SetSkyLuaTexture(const MapTextureData& td)
+{
+	if (sky == nullptr)
+		return;
+
+	/* TODO: consider if perhaps there should be some way to set the
+	 * sky to one of the other classes (CModernSky, etc) via Lua. */
+
+	if (td.id != 0u && dynamic_cast<CSkyBox*>(sky.get()) == nullptr) {
+		auto luaSky = std::make_unique<CSkyBox>(td.id, td.size.x, td.size.y);
+
+		if (luaSky->IsValid()) {
+			sky = std::move(luaSky);
+			return;
+		}
+
+		LOG_L(L_WARNING, "[ISky::%s] failed to create SkyBox from Lua texture (%u), keeping current sky", __func__, td.id);
+		return;
+	}
+
+	/* FIXME: td.id == 0 reaches here. Untested in recent times */
+	sky->SetLuaTexture(td);
+}
+
 void ISky::SetSkyAxisAngle(const float4& skyAxisAngleRaw)
 {
 	auto axis = float3{ skyAxisAngleRaw.x, skyAxisAngleRaw.y, skyAxisAngleRaw.z };
diff --git a/rts/Rendering/Env/ISky.h b/rts/Rendering/Env/ISky.h
index e0632e96d5..62fc19d188 100644
--- a/rts/Rendering/Env/ISky.h
+++ b/rts/Rendering/Env/ISky.h
@@ -50,6 +50,7 @@ class ISky
 	void SetUpdated() { updated = true; }
 public:
 	static void SetSky();
+	static void SetSkyLuaTexture(const MapTextureData& td);
 	static auto& GetSky() { return sky; }
 	static void KillSky() { sky = nullptr; }
 public:
diff --git a/tools/pr-downloader b/tools/pr-downloader
index 1b95b70bdb..09a1f37c77 160000
--- a/tools/pr-downloader
+++ b/tools/pr-downloader
@@ -1 +1 @@
-Subproject commit 1b95b70bdb63923f21f2b6b08240dd769cc733b9
+Subproject commit 09a1f37c77a014f24c3116ac7b7d2e318d0ce0de