Environment

• Pythonnet version: master
• Python version: any
• Operating System: any

Details

1. Initialize Runtime
2. Create a few PyObjects, keep them somewhere
3. Shutdown Runtime
4. Initialize Runtime the second time
5. Clear all alive reference to objects from step 2.
6. Call GC.Collect and WaitForPendingFinalizers

Expected: XDecref should never be called on the handles in PyObjects from step 2.
Actual: XDecref is called on the handles in PyObjects from step 2.

I saw this happen even to .NET types reflected to Python like System.MulticastDelegate. Will soon open a PR with repro.