There will not be a 4.13.3 at this point. Most likely the fix was incorporated into a later version. Could you forward where you saw a 4.13.3 exists so I can track down what version has fixed the bug? Also, not sure if you have reviewed the source code information on GitHub… you can review specific commits, etc. Get there: https://github.com/EpicGames/UnrealEngine
Also, check out Issues at https://issues.unrealengine.com/ do a search for your bug and see what version has had the issue fixed. Try this first before GitHub!