I believe the first one was caused by outdated mods or custom content. CC beds were broken but can be fixed with Sims4Studio.
Almost all mods needed an update. Most of them have gotten that done already.
The other three seem to happen to some, but not all players. And, of course, are limited to players with the new pack. The last one is a routing problem. The work around is to add the Sim you want to ride with to your household temporarily. There are threads here about prom and graduation you can read to see how others are handling them.