This doesn't happen often, but sometimes this chain of events takes place (on both Windows and Linux):

- Game is running.
- I modify a panel. In one case, I moved a Border containing a stackpanel and some buttons to a different grid.
- The modification triggers hot reloading.
- Unity deadlocks.
- I have to kill Unity.
- When Unity restarts, the scene load hangs with "waiting on callback in NoesisLangServer"
- This sits for about 30 seconds and then things are fine.

I don't have any more specific information, so I'm a little hesitant to make a bug report on it and I don't have a stripped down simple repro to share.

Ah, looks like it isn't locking up, Noesis just gets into a state where NoesisLangServer is doing something when a xaml changes that takes 30 seconds.

Disabling the Noesis language server integration in Rider fixed the problem. I wonder if there is a bad interaction between the 3.2.8 language server, Rider 2025.2.2.1, and Unity 6000.2.

Hey Brandon,

When Unity deadlocks after Hot Reload, and when the Language Server hangs for around 30 seconds, could you please attach the Visual Studio debugger, pause the process, and save a minidump (Debug → Save Dump As…)?

After that, could you file a ticket and include both dumps?

Thank you!

Sure, I'll do that tomorrow morning.