Ancalagon
Dusty Dragon
Eh, there's some debate in that reading.
Fast Hands lets you take the Magic action to use a magic item that requires the action as a bonus action.
A spell scroll itself doesn't require you to take the Magic action to use it. It requires that you "cast the spell using its normal casting time." That does mean you have to take the Magic action, but it's not required by the scroll, it's required by the spell itself.
It's not unreasonable to argue that this means it de facto requires you to take the Magic action, but the wording of both spell scrolls and the Magic action are pretty ardent that the casting time of the spell is the time it takes to cast the spell.
That is a very good point - I think we'll have to wait for the DMG and more magic item rules to really know!
Though, yeah, still not the end of the world if your interpretation differs and you want to allow wizard/rogues to cast cantrip scrolls as a bonus action. Still such a great effort for such a small win.
reliably doing 2 sneak attacks/round is not "small" IMO.