Avoid crashes caused by ME conduits

[DoctorNefario]

Description

This is a quick change to prevent crashes, and should probably be undone if/when the conduit interface changes.

Fixes #505
Fixes #530
Fixes #560

Steps to reproduce the crash this commit fixes:

1. Move somewhere that can be unloaded, e.g. /tp 5000 200 0
2. Place an ME conduit
3. Unload it by leaving the area, /tp 0 200 0
4. Load chunk containing the conduit, /tp 5000 200 0

The issue seems to be that conduits objects are reused after onRemoved is called, changing that should also fix the crash.

Checklist:

• My code follows the style guidelines of this project (.editorconfig, most IDEs will use this for you).
• I have performed a self-review of my own code.
• I have commented my code in areas it may be challenging to understand.
• I have made corresponding changes to the documentation.
• My changes are ready for review from a contributor.

[justliliandev]

I was able to reproduce the problem and it seems like this fixes it, I have no idea how many much time I wasted looking into this and not seeing the problem. tysm