How to? 3x Scenario @ Difficulty III There are two such scenarios for CJP. Is this wrong description or how to achieve that? Spoiler: it is a joke, you know, a joke :D without buying a new computer
Yes, unfortunatley you have to do one of the two avaliable scenarios twice. But the mastery counts it correctly at least. (I still can‘t get the scenarios on Island Line 2022 to count in tier 2 there)
Even if you have completed Island Line 2022 Mastery, there is no way to select the out-of-service 483 in the overlay, it is simply missing.