Kuttoe has fixed several events including Stay Over Calls! (Patreon)

https://forums.ea.com/idea/the-sims-4-bug-reports-en/gro-stay-over-calls-never-happen/12013222

https://kuttoe.itch.io/mini-mods-bug-fixes
https://www.patreon.com/posts/new-bug-fix-and-135805452?post_id=135805452

Kuttoe has fixed a bug that, in part, caused Stay-over calls to only happen ONCE! PER! SAVE! FILE! which means the first one you got is the ONLY one you'd EVER get. You couldn't even get the guaranteed ones that can be forced to happen, like researching Geneaology. Amazing!

Reply to the forum thread and me-too it so it gets an official fix now that Kuttoe has identified the issue!

IMO You cant blame EA for missing this one, because they definitely dont sit down and play the game for however-long-it-takes for a random phone call to proc, right? They force it with a debug cheat or whatever. And if it works there you gotta assume the phone call system is working otherwise. Then they'd probably test the ones you can force by starting a new game and checking the geneaology stayover or something (same way I did testing), and go "yep seems good" and not pick up on it cancelling the whole system out forever.

Worse, that's the kind of bug where if you were doing hardcore long-term gameplay testing, you wouldn't catch it because it only breaks if you're not doing long-term hardcore testing. im fascinated! What a strange situation for a bug to find itself in. It's only detectable if you play like a normal person, when most game testing isn't done like a normal person.