Server is on the latest release of oxide, v2.0.5246, zero plugins running currently to make sure its not within a plugin. Players are kicked as soon as they craft a skull rock and can not re-enter the server until the item is removed from thier inventory.

From server console
disconnecting: Assertion failure. Values are not equal. Expected: 0 == 1 at UnityEngine.Assertions.Assert.Fail (System.String message, System.String userMessage) [0x00000] in <00000000000000000000000000000000>:0 at UnityEngine.Assertions.Assert.AreEqual[T] (T expected, T actual, System.String message, System.Collections.Generic.IEqualityComparer`1[T] comparer) [0x00000] in <00000000000000000000000000000000>:0 at UnityEngine.Assertions.Assert.AreEqual[T] (T expected, T actual, System.String message) [0x00000] in <00000000000000000000000000000000>:0 at UnityEngine.Assertions.Assert.AreEqual (System.Int32 expected, System.Int32 actual) [0x00000] in <00000000000000000000000000000000>:0 at MaterialReplacement.ReplaceRecursive (UnityEngine.GameObject obj, UnityEngine.Material[] find, UnityEngine.Material[] replace) [0x00000] in <00000000000000000000000000000000>:0 at Rust.Workshop.Skin.Apply (UnityEngine.GameObject obj, Skinnable skinnable, UnityEngine.Material[] Materials) [0x00000] in <00000000000000000000000000000000>:0 at ItemSkin.ApplySkin (UnityEngine.GameObject obj) [0x00000] in <00000000000000000000000000000000>:0 at BaseEntity.OnSkinChanged (System.UInt64 oldSkinID, System.UInt64 newSkinID) [0x00000] in <00000000000000000000000000000000>:0 at BaseEntity.Load (BaseNetworkable+LoadInfo info) [0x00000] in <00000000000000000000000000000000>:0 at HeldEntity.Load (BaseNetworkable+LoadInfo info) [0x00000] in <00000000000000000000000000000000>:0 at BaseNetworkable.ClientInit (ProtoBuf.Entity info) [0x00000] in <00000000000000000000000000000000>:0 at BaseEntity.ClientInit (ProtoBuf.Entity info) [0x00000] in <00000000000000000000000000000000>:0 at HeldEntity.ClientInit (ProtoBuf.Entity info) [0x00000] in <00000000000000000000000000000000>:0 at BaseNetworkable.ClientSpawn (ProtoBuf.Entity info) [0x00000] in <00000000000000000000000000000000>:0 at Client.CreateOrUpdateEntity (ProtoBuf.Entity info, System.Int64 size) [0x00000] in <00000000000000000000000000000000>:0 at Client

From F1 Console
AssertionException: Assertion failure. Values are not equal.
Expected: 0 == 1
Disconnected (Assertion failure. Values are not equal.
Expected: 0 == 1
at UnityEngine.Assertions.Assert.Fail (System.String message, System.String userMessage) [0x00000] in <00000000000000000000000000000000>:0
at UnityEngine.Assertions.Assert.AreEqual[T] (T expected, T actual, System.String message, System.Collections.Generic.IEqualityComparer`1[T] comparer) [0x00000] in <00000000000000000000000000000000>:0
at UnityEngine.Assertions.Assert.AreEqual[T] (T expected, T actual, System.String message) [0x00000] in <00000000000000000000000000000000>:0
at UnityEngine.Assertions.Assert.AreEqual (System.Int32 expected, System.Int32 actual) [0x00000] in <00000000000000000000000000000000>:0
at MaterialReplacement.ReplaceRecursive (UnityEngine.GameObject obj, UnityEngine.Material[] find, UnityEngine.Material[] replace) [0x00000] in <00000000000000000000000000000000>:0
at Rust.Workshop.Skin.Apply (UnityEngine.GameObject obj, Skinnable skinnable, UnityEngine.Material[] Materials) [0x00000] in <00000000000000000000000000000000>:0
at ItemSkin.ApplySkin (UnityEngine.GameObject obj) [0x00000] in <00000000000000000000000000000000>:0
at BaseEntity.OnSkinChanged (System.UInt64 oldSkinID, System.UInt64 newSkinID) [0x00000] in <00000000000000000000000000000000>:0
at BaseEntity.Load (BaseNetworkable+LoadInfo info) [0x00000] in <00000000000000000000000000000000>:0
at HeldEntity.Load (BaseNetworkable+LoadInfo info) [0x00000] in <00000000000000000000000000000000>:0
at BaseNetworkable.ClientInit (ProtoBuf.Entity info) [0x00000] in <00000000000000000000000000000000>:0
at BaseEntity.ClientInit (ProtoBuf.Entity info) [0x00000] in <00000000000000000000000000000000>:0
at HeldEntity.ClientInit (ProtoBuf.Entity info) [0x00000] in <00000000000000000000000000000000>:0
at BaseNetworkable.ClientSpawn (ProtoBuf.Entity info) [0x00000] in <00000000000000000000000000000000>:0
at Client.CreateOrUpdateEntity (ProtoBuf.Entity info, System.Int64 size) [0x00000] in <00000000000000000000000000000000>:0
at Client.OnEntities (Network.Message packet) [0x00000] in <00000000000000000000000000000000>:0
at Client.OnNetworkMessage (Network.Message packet) [0x00000] in <00000000000000000000000000000000>:0
at Facepunch.Network.Raknet.Client.HandleMessage () [0x00000] in <00000000000000000000000000000000>:0
at Facepunch.Network.Raknet.Client.Cycle () [0x00000] in <00000000000000000000000000000000>:0
at Client.Update () [0x00000] in <00000000000000000000000000000000>:0 ) - returning to main menu

I'm going to wipe the server again and try fresh. I did have plugins running when I initially crafted the item so want to rule out that a plugin has caused something that is persistent.

Merged post

Crafting Controller is causing the issue, it doesn't go away when the plugin is unloaded though. I'll raise this in the crafting controller section.