Updated for Sept 3rd Rust release.

This was a huge pain to get working and troubleshooting on both Procedural & Custom Maps. Problem came down to the new fishing monuments using the same NPCVendingMachine Profile. 

SO in order to get this to work, I had to DISALLOW the Fishing Monuments vending to be changed. Now it works as before. I will contiue to try and find a working solution for the new fishing monuments. I have notified FacePunch Devs (hopefully the request does not fall on deaf ears).

Failed to call hook 'Unload' on plugin 'CompoundOptions v1.1.6' (NullReferenceException: Object reference not set to an instance of an object)
  at Oxide.Plugins.CompoundOptions.GetDefaultOrders (NPCVendingMachine vending) [0x00011] in <c27cd0db86984375ad0ccc0f04bb9460>:0
  at Oxide.Plugins.CompoundOptions.Unload () [0x0005b] in <c27cd0db86984375ad0ccc0f04bb9460>:0
  at Oxide.Plugins.CompoundOptions.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x0014b] in <c27cd0db86984375ad0ccc0f04bb9460>:0
  at Oxide.Plugins.CSharpPlugin.InvokeMethod (Oxide.Core.Plugins.HookMethod method, System.Object[] args) [0x00079] in <d09a1f46ca2f4432811bcfe45ad13c7b>:0
  at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[] args) [0x000d8] in <cf88a28c7fb44d36890d85a78331cc9d>:0
  at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00060] in <cf88a28c7fb44d36890d85a78331cc9d>:0
Calling 'Unload' on 'CompoundOptions v1.1.6' took 115ms
Unloaded plugin Compound Options v1.1.6 by FastBurst

 I tried reloading the plugin and restarting the server.
Just realized what you said earlier about a facepunch fix so I'm updating the server and oxide. I bet it will work after I update my files. Thanks!
It worked