Visual Basic compiler crashes when project uses NetSparkleUpdater.UI.WinForms.NetFramework and Async lambdas

With NetSparkleUpdater.UI.WinForms.NetFramework v3.1.0 (and prior) in a VB WinForms project compiling with VS2026, vbc.exe crashes and the project won't compile.

there is an entry in Windows Event Viewer: Application: vbc.exe
Framework Version: v4.0.30319
Description: The application requested process termination through System.Environment.FailFast(string message).
Message: System.InvalidOperationException: This program location is thought to be unreachable. File='/_/src/Compilers/VisualBasic/Portable/Lowering/AsyncRewriter/AsyncRewriter.vb' Line=131
at Microsoft.CodeAnalysis.VisualBasic.AsyncRewriter.CreateMethodBinder(MethodSymbol method)

I asked Copilot, and it responded as below:

Copilot:
That's the smoking gun.
The important part is:

System.InvalidOperationException:
This program location is thought to be unreachable.

File='/_/src/Compilers/VisualBasic/Portable/Lowering/AsyncRewriter/AsyncRewriter.vb'
Line=131

at Microsoft.CodeAnalysis.VisualBasic.AsyncRewriter.CreateMethodBinder(MethodSymbol method)

This is not a NetSparkle runtime issue and not an assembly-binding problem. It's an internal Roslyn VB compiler bug.
The compiler is crashing while lowering (rewriting) an async method/lambda into its state machine. Specifically, it is inside the VB AsyncRewriter.
The fact that:
adding NetSparkleUpdater.UI.WinForms.NetFramework triggers it,
removing that reference avoids it,
the crash only occurs with Task.Run(Async Function() ...),
strongly suggests that the additional metadata/type information introduced by the NetSparkle assemblies is exposing a bug in the VB compiler.
End Copilot

Is there any possibility of this being fixed/worked around in a future release of NetSparkle.UI.WinForms?

Thank you.

Start by reproducing the report with NetSparkleUpdater.UI.WinForms.NetFramework v3.1.0 in a VB WinForms project using VS2026 and a Task.Run async lambda. Compare compilation with and without the NetSparkle reference, then inspect the reported Microsoft.CodeAnalysis.VisualBasic.AsyncRewriter failure. Done means establishing whether NetSparkle can provide a workaround or whether the failure belongs upstream in the VB compiler.