Scene NetworkObjects get destroyed if the user starts and stops as host multiple times

[PhiSel]

Bug Description

In a context of lobbies where users can spawn lobbies, connect to other lobbies and leave them, NetworkObjects in the scene get destroyed if client is shutdown twice.

Reproduction steps

1. Create a new Scene
2. Setup a NetworkManager with UNET-Transport
3. Add a GameObject with a NetworkObject (Dont Destroy with Owner = true)
4. Start Playmode
5. Click "Start Host"
6. Click "Stop Host"
7. Click "Start Host"
8. Click "Stop Host"

Actual outcome

The GameObject with the NetworkObject gets destroyed.

Expected outcome

The GameObject stays in the scene after shutdown.

Environment

• OS: Windows 10
• Unity Version: 2020.3
• Netcode Version: 1.0.0-pre.5

Additional observations

At the first "Start Host", the NetworkObject is owned by the server and labeled as "IsSceneObject = true".
At the second "Start Host", the NetworkObject asks to be spawned (Spawn-Button in the inspector). If the button is clicked, the NetworkObject is owned by the server but labeled as "IsSceneObject = false"

Maybe this bug is related to this bug report: #1670

[ashwinimurt]

Added to our backlog MTT-3018

[jeffreyrainy]

This looks like a duplicate that was fixed by either:

#1809
#1769

Indeed duplicates #1670

Please try pre.7 or above. Thanks !