Currently i got this error message when i will start our server and the server seems like wiped...

Error loading save (server/rustserver/Isla Nublar 1.1.8 - MF.219.sav) 
(Filename: ./Runtime/Export/Debug/Debug.bindings.h Line: 39)

AssertionException: Assertion failure. Value was False
Expected: True
BaseEntity.saveList isn't empty!
  at UnityEngine.Assertions.Assert.Fail (System.String message, System.String userMessage) [0x00043] in <ba657ba1ce6746c39d9263534c2395e1>:0 
  at UnityEngine.Assertions.Assert.IsTrue (System.Boolean condition, System.String message) [0x0000f] in <ba657ba1ce6746c39d9263534c2395e1>:0 
  at SaveRestore.Load (System.String strFilename, System.Boolean allowOutOfDateSaves) [0x0013e] in <6e74495fe0dd410fa40b681d5f3aeccd>:0 
UnityEngine.DebugLogHandler:Internal_LogException(Exception, Object)
UnityEngine.DebugLogHandler:LogException(Exception, Object)
UnityEngine.Logger:LogException(Exception, Object)
UnityEngine.Debug:LogException(Exception)
SaveRestore:Load(String, Boolean)
ServerMgr:Initialize(Boolean, String, Boolean, Boolean)
<StartServer>d__19:MoveNext()
UnityEngine.SetupCoroutine:InvokeMoveNext(IEnumerator, IntPtr)

I just had the same thing happen to me.
"Error loading save"
Server is wiped.

It was bad enough having nearly every bot-related plugin broken by this update and my entire reward system getting broken so much I needed to install a different plugin but to now have the save game lost after a server reboot is just adding insult to injury.

Facepunch have really done it this time.

Have you find the issue yet?

No. My server is dead in the water as I won't risk letting people play unless I can be certain the save game is going to work properly. We are waiting for Facepunch to release an update to fix this, then Oxide to also be updated - only then will I restart my server.

This problem is not a FP problem, this is a plugin mod. But need to know with one XD 

My server is running 112 plugins.
*sigh
Looks like I better get started going through them then... I'll report back if I find something

Are you seeing similar messages as this: uMod - Server don't load after update - map generate error - Rust - Community 

No, it just gets to the step during startup where it goes to load the save file and it comes up with this:

Error loading save (server/the_island/proceduralmap.6000.7250645.219.sav)
AssertionException: Assertion failure. Value was False
Expected: True
BaseEntity.saveList isn't Empty!

.. after that it continues starting normally but once started the map is wiped.

In my case, I've solved the problem.
The error was caused due to a buggy plugin. The previous BotSpawn plugin no longer works with the current Rust version. Therefore, I replaced the BotSpawn plugin with the BotReSpawn plugin, which causes that the savefiles could no longer be loaded. The problem was fixed in BotReSpawn version 2.0.2 and then I was able to load my savefiles, which I usually create shortly before our server restarts. Now it works successfully and without errors.

Confirmed. It loaded up the save game fine this time.

wipes fixed after botrespawn, but my vendors etc its still gone