I see somewhat similar posts but just wanted to post this as I didn't seem to find anyone with the exact same issue.
Honestly every single thing seems fine except for Patrol Helicopter kills. I had major issues with Death Notes as well until I got GUI Announcements and that works MUCH better. I still use Death Notes but Death Notes also never seemed to want to let me give a player credit for a heli kill.
Any ideas? Here is my console error.
Failed to call hook 'OnEntityDeath' on plugin 'RustRewards v3.0.3' (NullReferenceException: Object reference not set to an instance of an object)
at Oxide.Plugins.RustRewards.OnEntityDeath (BaseEntity entity, HitInfo info) [0x001a1] in <f9f800b8b6184348b4439a80a5903af3>:0
at Oxide.Plugins.RustRewards.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x0078a] in <f9f800b8b6184348b4439a80a5903af3>:0
at Oxide.Plugins.CSharpPlugin.InvokeMethod (Oxide.Core.Plugins.HookMethod method, System.Object[] args) [0x00079] in <60c318df79ed41688ea59335e48d61ad>:0
at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[] args) [0x000d8] in <9882f28dc2204b4dba514a9ad18f5042>:0
at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00060] in <9882f28dc2204b4dba514a9ad18f5042>:0