Quick question regarding act rank triangle for Immortal+. I've only been playing for a couple months, and have just now gotten to Immortal (and subsequently been getting a lot of last act immortals in my games), but some of how the act rank triangle works for immortal+ is a bit confusing for me since I haven't played that long. Specifically, I'm not sure how the number below the actual triangle is determined.

Is the number based on the best leaderboard spot you ever reached, or is it based on the exact spot you're in when the season ends? I figure it's the latter, since I sometimes see Immortal act ranks without a number at all (which would imply that they fell out of immortal by the time the act ended).

Apologies if this is answered elsewhere, I looked through the FAQ, online articles, and the valorant site itself but couldn't find a clear answer.