FixedRotation issue with UseMultithreadedInitialization

[micahnyc]

Sometimes, when you startup, you can get this error "(W) FixedRotation Missing attachment node" and it's never ending in the console creating a huge drop in fps. I found that setting UseMultithreadedInitialization = false made it so that I never get the issue.

This happened to me last week in the dome for the first time when I had a profile with way more assets in it than usual.

We also got a report of this from a user today: https://openspacesupport.slack.com/archives/C04TY4ZKXV2/p1715266070402949

[alexanderbock]

Adding to the warning message for which node the attachment node can't be found to make debugging this easier