I believe these are the ones where you pick a name for the girl to call you. I don't think those have been missable before unless you could completely avoid the girl.
Although, I'm not sure how many of those were part of chains.
I actually cant wait to see what options Sel has for Molly. Especially with all of her nicknames for everybody else.
You're probably right, once you made the choice to fuck them they haven't been missable just had a 5 lust requirement until now (And even now Sana and Molly would already have more than 5 lust each if you're on green path)
Niki's was part of a previous beach update (Where you fuck her next to Wakana and friends), Imani's was part of the last Dorm Wars (Which made the whole dorm wars unable to start without 5 Imani lust which Sel probably learned a lesson from).
This probably means Molly won't have penetration unless Sel is bored of leading us on (complete with discord screenshot of "I already showed you Akira was fucking her what are you stupid?")
If it is their lust name events, Sel might be in full "Gotta get everyone fucked" mode. Introducing their invite events this reset, finishing the reset with their lust names. Next reset might have a new batch of fuckees (and the proper Noriko invite events surely) Nodoka's can wait until we break her out of autopilot.