The imported type `Steamworks.SteamServer' is defined multiple timesSolved
Every time I try to compile this

Puts("valid {0}", Steamworks.SteamServer.IsValid);

I get

Error while compiling: Test.cs(48,46): error CS0433: The imported type `Steamworks.SteamServer' is defined multiple times

How do you fix this?
Delete the duplicate Steamworks DLL under your RustDedicated_Data/Managed install.

If a Windows server, delete Facepunch.Steamworks.Posix64.dll

If a Linux server, delete Facepunch.Steamworks.Win64.dll
5df88518bef43.png Wulf
Delete the duplicate Steamworks DLL under your RustDedicated_Data/Managed install.

If a Windows server, delete Facepunch.Steamworks.Posix64.dll

If a Linux server, delete Facepunch.Steamworks.Win64.dll

What if a future update puts it back?

It shouldn't.
Locked automatically