Time.timeScale = 0 prevents UnitySynchronizationContext.Post

[DonaldHLG]

I've created this as an issue with Unity, as it is to do with their implementation of the SynchronizationContext; but it appears setting Time.timeScale = 0f delays the continuations being run on Unity's thread until it is increased above 0.

We found this while using the provided new WaitForUpdate/ Awaiters.NextFrame from a background task.

Unity Ticket: 1057404

[StephenHodgson]

I'm surprised wait for next frame slows down with the timescale.

Not surprised about update slowing and stopping though.