[ARCHIVED] Can't have more that one part time job (same time, different days)

So I've noticed this "problem" when i tried to assign my uni student sim for part time job. Since adult sims can have two part time jobs, i wanted her to work as Barista on weekdays & Manual Laborer on the weekend but when i applied for second job the game won't allow me...I thought that was weird cuz both schedules aren't conflicting at all, then i tried to experiment mixing all the part time jobs & i found that the morning shift weekdays-only jobs conflicted with morning shift weekend-only jobs, same with the night shift counterparts too. Other than that it's fine..

These are the jobs that conflicted with each other:

- Barista (Mon - Fri / 5 AM - 7 AM) with Manual Laborer (Sat - Sun / 7 AM - 12 PM) 

- Barista (Mon - Fri / 5 AM - 7 AM) with morning shift Babysitter (Sat-Sun / 7 AM - 1 PM)

- Morning shift Fisherman (Mon - Fri / 5AM - 9 AM) with Manual Laborer (Sat - Sun / 7 AM - 12 PM) 

- Morning shift Fisherman (Mon - Fri / 5AM - 9 AM) with morning shift Babysitter (Sat-Sun / 7 AM - 1 PM)

- Night Shift Fisherman (Mon - Fri / 9 Pm - 1 AM) with night shift Babysitter (Sat - Sun / 6 PM - 12 AM)

I've tried playing without mods and still have the same results. I'm curious is this a bug or it's always been like this? Like...the game didn't allowed sims to work everyday or what? Feel kinda sad cuz it's ruined my plan. Oh another thing, the Barista job performance didn't progress AT ALL! It's been a week and my sim is still stuck on level 1 with average job performance, never happened before...it's really annoying!