Hi, I know this is an old issue but I've experienced the same behaviour and this is the only mention of it on the web. I've resolved the issue by using different functions for creating my create and update subscriptions, and this works every time but the solution feels clunky. How did you implement the wait for each subscription to finish? was this via async / await?

I have to agree, this is ridiculous. I have a 2014 MacBook Pro in pristine condition that that is now basically no good for iOS development. I understand Apple is keen to deprecate the Intel hardware as quickly as possible but this feels like forced obsolescence.