well i dont know if i could replicate the problem exactly, was it that u were standing in one spot & when it switched to an alt time via cycle all peds disappeared right in front of ur eyes, or was this (how idol put it) where ur coming out of a mission, etc & one of the times of day slices is picked & the peds are gone?
what i tried was just playing a bunch of cutscenes & letting them finish, so it would probably pick a random time to spawn me back to HQ. out of the 18 times where i got an alt slice, there was one time where when i dropped down to the street i noticed a lack of peds & pretty barren. i manually hit the "R+END" key to change the time & i tapped it probably twice cuz i wasnt being patient, but anyway, after manually switching the times, all the peds & stuff were back right away. so maybe just have something do an automatic "R+END" at the end of cutscenes or mission replays or something, just in case? i dont know if thats possible or what, but that's all it took. i could not replicate the problem again after that. & even hat was kind of sketchy, it wasnt a huge dramatic lack of activity, but its true there were no peds at the bottom of the HQ. only parked cars. spun around, yes could see peds in distance. hit TOD keystroke then spun around again & there were now local peds like typical. i couldn't get the problem to really appear reliably, but all i was doing was trying with cutscenes to generate a random time. i only counted as part of the 18 when it actually picked a different time.... that seemed (maybe my imagination) on whether or not i let the whole cutscene play. if i just started it & ended, it seemed to keep me at whatever time i was at. but thats irrelevant im sure. but the good news is that whatever it is, & when its narrowed down or even if its not, just an auto time of day switch when transporting back to HQ or whenever, or just a manual one or whatever clears it up. if it turns noon & happens i would just click R+END 4 times til it comes back to noon. lol. or actually, when u have the thing cycle idol, maybe have it cycle twice every time it goes to the next one, just have it go again, that should fix it as well in theory.... but it sounds like nothing that would prevent u from wanting the option even if just via toggle & not thru cycle, as long as there's no other issues with it so i guess i'll try to do the other times as requested by someone. and to those requesting, these are still shitface's times, & if i screw anything up, sorry. there will be slight differences only becuz of the nature of what we're doing since the basic noon starts at noon, as with in the mod becuz it just replaces the other "noon," but since they all have to live together here, SF's 'noon' might actually be 'SF's noon at 1pm.' very subtle differences in where the sun is in the sky & stuff, no way around that, & nothing anybody will care about i imagine. thats just the only way his times or any alt times can live together.