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/CsScriptLoader.cs

@@ -12,7 +12,7 @@ using System.Reflection.Metadata;
 
 namespace Barotrauma
 {
-	class CsScriptLoader : AssemblyLoadContext
+	class CsScriptLoader : CsScriptBase
 	{
 		public LuaCsSetup setup;
 		private List<MetadataReference> defaultReferences;
@@ -20,7 +20,7 @@ namespace Barotrauma
 		private Dictionary<string, List<string>> sources;
 		public Assembly Assembly { get; private set; }
 
-		public CsScriptLoader(LuaCsSetup setup) : base(isCollectible: true)
+		public CsScriptLoader(LuaCsSetup setup)
 		{
 			this.setup = setup;
 
@@ -62,6 +62,7 @@ namespace Barotrauma
 			var syntaxTrees = new List<SyntaxTree>();
 
 			if (sources.Count <= 0) throw new Exception("No Cs sources detected");
+			syntaxTrees.Add(AssemblyInfoSyntaxTree(NET_SCRIPT_ASSEMBLY));
 			foreach ((var folder, var src) in sources)
             {
 				try
@@ -92,7 +93,7 @@ namespace Barotrauma
 				.WithMetadataImportOptions(MetadataImportOptions.All)
 				.WithOptimizationLevel(OptimizationLevel.Release)
 				.WithAllowUnsafe(false);
-			var compilation = CSharpCompilation.Create("NetScriptAssembly",syntaxTrees, defaultReferences, options);
+			var compilation = CSharpCompilation.Create(NET_SCRIPT_ASSEMBLY,syntaxTrees, defaultReferences, options);
 
 			using (var mem = new MemoryStream())
 			{
@@ -153,10 +154,5 @@ namespace Barotrauma
         {
 			Assembly = null;
         }
-
-		~CsScriptLoader()
-		{
-			
-		}
 	}
 }