"NPCAutoTurret' expression to type `StorageContainer'"

It seems that among the changes made to the turrets, the storage capacity in NPCAutoTurret has now been removed.

Can someone tell me how I can investigate this kind of changes?

Do I need to decompile the game in Unity or something similar to see what functions the objects have?

You can either use Visual Studio's IntelliSense or decompiler Assembly-CSharp.dll and see.