I believe some were. The plan was to switch over to two engines on ascent, and use two engines during the rapid deceleration. The full shut down was intentional

I believe some were. The plan was to switch over to two engines on ascent, and use two engines during the rapid deceleration. The full shut down was intentional. It looks like they might have briefly went to one engine during ascent but it wasn't entirely clear. The flame out of the first shut off was probably not intentional as well. It's really hard to tell. None of that information was official though so take it with a grain of salt, it's all come from personal knowledge and analysis by some people watching.