It seems changing order has no effect.
No. Script execution order is built into the core application data, not the asset bundles created for avatars/worlds.
How can I order which script run first without Awake() and unable to control execution order of Start()? I need to initialize some script first before other script access it.
I noticed Udon Graph Program Asset have a update order option. Do I have that option with udonsharp?
Using this attribute solves the problem: