Bug Dlls unloaded before OnDisable?

I tried moving shared code between Unity and a server to a shared lib, but it seems to get unloaded before OnDisable gets fired.

Basically in OnDisable I send a disconnect packet to the server, it works if I use a packet class inside Unity, but when I move that same code to the class library the dll is being unloaded before OnDisable fires and it can't find the packet...all other packets work from the class lib, just not what's being called in OnDisable. The DLL isn't sending anything it's just packet concrete implementations I'm using from 2 projects

Is that normal behavior? Unity 2021.3.f16 LTS

 

Here is some timing diagram help:

https://docs.unity3d.com/Manual/ExecutionOrder.html

Find where in that diagram you are unloading the DLL and adjust accordingly.

 

Didn't know about OnApplicationQuit thanks!