Actually, at least on my P6P and many others on this forum, it's totally random when we get the "capture more" option and has been that way since day 1. There are a couple threads about it here and over on the A12 forum. The update hasn't changed or "fixed" that for many of us.
I came from a Note 8 and Samsung really got the long screenshot feature down perfectly. I could capture a ridiculously long screen from any webpage or most any app on my phone and it was great. I *thought* this built in Android 12 feature would be at least as good but it's got a long way to go to be perfected.