NetworkPrefab has a duplicate GlobalObjectIdHash source entry value of XYZ

Describe the bug: Every now and then, I get this issue when trying to enter play mode:

NetworkPrefab (Example1) has a duplicate GlobalObjectIdHash source entry value of: 951099334! Removing entry from list! NetworkPrefab (Example2) has a duplicate GlobalObjectIdHash source entry value of: 951099334! Removing entry from list! NetworkPrefab (Example3) has a duplicate GlobalObjectIdHash source entry value of: 951099334! Removing entry from list!

It seems to happen with some of the prefabs in my network prefabs list. To fix it, I just revalidate the NetworkObject component (e.g., toggle one of the parameters on and off), and another GlobalObjectIdHash is generated. I tried completely removing and re-adding the NetworkObject components from each of the prefabs, however, it didn’t seem to work.

To reproduce: I unfortunately cannot seem to deterministically reproduce this error.

Screenshot:

Environment:

• OS: Windows 10
• Unity Version: 2020.3.12f1
• Netcode Version: 1.0.0-pre.3
• Unity Transport Version: 1.0.0.-pre.10
• Transport for Netcode Version: 1.0.0-pre.3

[NoelStephensUnity]

Ahh… yeah there have been several updates since v1.3.1 that might avoid some of the issues you are encountering. ParrelSync has been known to cause issues with prefabs and getting out of synchronization with the primary editor instance (editor that you are making changes to a prefab within).

I was diverted to a different issue yesterday so I haven’t had a chance to get back to this bug search… but will definitely post a link to the branch once I have pushed it to the repository. 👍

[MikeSchurman]

I’m following this issue with interest as the 951099334 issue is happening more frequently for us now. For now we’ve bypassed the issue by adding a button to call OnValidate on all our NetworkObjects.

I’ve always seen this on our parrelsync clone, however just this morning every prefab in the main editor project was 951099334 for one of our team members.

I’ve added some prints this morning to GenerateGlobalObjectIdHash to see what is going on, but there’s not much of a stack with OnValidate unfortunately.

Some interesting tidbits from prints so far:

• OnValidate seems to be called twice for each changed NetObj, most of the time, when doing a refresh on the parrelsync clone. The first time it gets the 951099334 value, but then it gets called again with the proper value.
• One time it only got one OnValidate call, but it was the correct value.
• On the main editor (ie not the clone) if I add a script to a netobj, it gets called 4 times:
  • 3 times from OnValidate (wrong, wrong, correct)
  • then a forth time from [Worker3], also correct.

I’ll let you know if/when I get the failure case.