"SetProvider" throws error with Zenject scene validator

[GyGerg]

When trying to bind MessagePipe as per the "zenject sample" instructions and validate it through Zenject's scene validator (Asset/Zenject/Validate [any]),

GlobalMessagePipe.SetProvider throws an error at line 21 when it's trying to access an EventFactory binding.

Null cast error by default, ("EventFactory has no binding" when the null check's replaced with an is not T,) even though it works properly in a build/play mode.