Data stream errors with unrecognized PacketIds when using nested NetworkObjects

[xaevman]

General
Unity version: 2022.3.7f1
Fish-Networking version: 4.0.2
Discord link: https://discord.com/channels/424284635074134018/1034477094731784302/1171924774746857523

#543 is a proposed fix for the issue, though I'm not sure it covers all intended use cases

Description
ClientManager complains about unknown PacketIds when spawning an instance of a prefab with relatively trivial nested NetworkObject hierarchy. This did not happen in Fish-Net v3, but is currently being experienced in 4.0.2.

Replication
You have been invited to a Github repo containing a basic repro: https://github.com/xaevman/FishNet-tests/tree/fish402-nested-errors
This repro is private since we are Pro users. An invite was sent to the FirstGearGames Github account.
Note the repro is in the fish402-nested-errors branch.

1. Basic Network manager set up
2. Create a player Prefab that contains a capsule for visualization, NetworkTransform, and NetworkObject components
3. Create another prefab with any basic NetworkBehaviour component (networked hitpoint tracker, for example) and NetworkObject component.
4. Add a sub-object to the Player prefab called "StatusBars", and add two copies of the Hitpoint tracker prefab as children to it.
5. Hit play and start server + client
6. Observe console errors about invalid PacketIds

Expected behavior
No errors, or if an invalid prefab hierarchy is being used, Fish-Net should log useful errors to help a user correct their content mistakes.

[FirstGearGames]

Thank you for the report and PR. I need to review them both more thoroughly but at a glance they looked good!
I'm releasing an update to v3 and this will follow near immediately after.

[FirstGearGames]

Resolved in 4.0.3 via PR