Doesn't work with configurable Enter Play Mode settings

[lcsondes]

The code heavily expects statics to be cleared between runs, which breaks when you use the faster Play Mode in newer versions of Unity. I have tried to fix this myself but none of my attempts worked (hence the issue instead of a PR, sorry).

I was testing with both Domain and Scene reload disabled.

Reference: https://docs.unity3d.com/Manual/ConfigurableEnterPlayMode.html

[mikehofm]

If it helps anyone, the problem seems to be in ContinuationProcessorGroup.Add():

var p = ContinuationProcessor<T>.instance;

if(p == null)
{
	p = ContinuationProcessor<T>.instance = new ContinuationProcessor<T>(InitialCapacity);
	processors.Add(ContinuationProcessor<T>.instance);
}

The static variable ContinuationProcessor<T>.instance isn't reset to null when domain reload is disabled, and therefore isn't added to the new processors list. One solution might be to add a variable to ContinuationProcessor that you could check to see if it's from a previous play session.

[muckSponge]

Thanks for investigating this. Looks like we need to hook into [RuntimeInitializeOnLoadMethod(RuntimeInitializeLoadType.SubsystemRegistration)] and reset all static fields to resolve this. I'm not on the right computer to push any code but for future reference, adding something like...

[RuntimeInitializeOnLoadMethod(RuntimeInitializeLoadType.SubsystemRegistration)]
static void Initialize()
{
	ContinuationProcessor<T>.instance = null;
}

..might help to resolve the issues. I'll work on it when I have access to my dev machine.