some improves and fixes:

1. should get the last loadded aseembly by checking its version instead of reversing.
2. fixed throw an exception when CsScriptRunner run the second time.
3. an argument carried by an UnregisterType called somewhere have had been accidentally removed.

Barotrauma/BarotraumaShared/SharedSource/LuaCs/Cs/CsScriptRunner.cs

@@ -13,7 +13,7 @@ using MoonSharp.Interpreter;
 
 namespace Barotrauma
 {
-	class CsScriptRunner : AssemblyLoadContext
+	class CsScriptRunner : CsScriptBase
 	{
 		public LuaCsSetup setup;
 		private List<MetadataReference> defaultReferences;
@@ -25,7 +25,7 @@ namespace Barotrauma
 			"System.Linq"
 		};
 
-		public CsScriptRunner(LuaCsSetup setup) : base(isCollectible: true)
+		public CsScriptRunner(LuaCsSetup setup)
 		{
 			this.setup = setup;
 
@@ -56,7 +56,7 @@ namespace Barotrauma
 			{
 				code = ToOneTimeScript(code);
 				var syntaxTree = SyntaxFactory.ParseSyntaxTree(code, CSharpParseOptions.Default);
-				var compilation = CSharpCompilation.Create("NetOneTimeScriptAssembly", new[] { syntaxTree }, defaultReferences, compileOptions);
+				var compilation = CSharpCompilation.Create(NET_ONE_TIME_SCRIPT_ASSEMBLY, new[] { AssemblyInfoSyntaxTree(NET_ONE_TIME_SCRIPT_ASSEMBLY), syntaxTree }, defaultReferences, compileOptions);
 
 				Assembly assembly = null;
 				using (var mem = new MemoryStream())
@@ -103,8 +103,7 @@ namespace Barotrauma
 									scriptResilt = method.Invoke(runner, null);
 									foreach (var type in assembly.GetTypes())
 									{
-										//UserData.UnregisterType(type, true);
-										UserData.UnregisterType(type);
+                                        UserData.UnregisterType(type, true);
 									}
 								}
 								else LuaCsSetup.PrintCsError("Script Error - no run method detected");
@@ -115,6 +114,8 @@ namespace Barotrauma
 					}
 				}
 				Unload();
+				GC.Collect();
+				GC.WaitForPendingFinalizers();
 			}
 			catch (Exception ex)
 			{