[FIXED] [DU] Attending skill classes confers mixology certificate

@EsperAngelWow finally a bug they fixed in the Sims 3 and used to be in base game of  The sims 4, if you completed a skill high enough you would get a certificate for that skill for completing it.

Product: The Sims 4
Platform:Xbox Series S
Which language are you playing the game in? English
How often does the bug occur? Every time (100%)
What is your current game version number? 1.49.38.2300
What expansions, game packs, and stuff packs do you have installed? Courtyard oasis, island living, luxury party, laundry day, snowy escape, vintage glamour, nifty knitting, jungle adventure, realm of magic, bowling night, cats and dogs, my first pet, outdoor retreat, country kitchen, throwback fit, toddler, dream home decorator, fitness, romantic garden, dine out, movie hangout, discover university, gnome on the go, perfect patio, spa day, kids room, industrial loft, parenthood, backyard, Strangerville, Moschino, animal hats, Tiny living, city living, get famous, life of the party, get to work, up all night, cottage living, get together, seasons, cool kitchen, grims guitar, Incheon arrivals, fashion street
Steps: How can we find the bug ourselves? Sit in on a skills class
What happens when the bug occurs? My Sims get a random mixology certificate that cannot be deleted from their inventory. I've never attended the mixology course for any Sim but always get the certificate.
What do you expect to see? I'd like to be able to delete it at least or not get it at all.
Have you installed any customization with the game, e.g. Custom Content or Mods? On console - never used.
Did this issue appear after a specific patch or change you made to your system? Yes
Please describe the patch or change you made. Installing Discover university pack.

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If there are certificates for courses, the appropriate one would be nice instead of this course they have never attended. Most of them don't even have the skill.

I also hate when things can't be deleted from the inventory. I just stick it on the wall and delete it via build mode if it lets me.

Edit By Crinrict: Added Tag to Title

I just had this happen to my sims also on PS5. They have attended lots of classes, but have no mixology skill at all. They both have mixology degrees now and certificates with no skill and never having taken a Mixology class.

This happens on the PC too so it is not limited to consoles.  It has been happening since DU was released.  Having the certificate does count for the last tier milestone of the Knowledge aspiration (I forget the name that atm) to earn a degree that came with DU and it works like having a full University degree in that you can get a Mixologist job at Level 8 once you have it.  Attending enough skill classes will earn you the certificate.  It does not matter what skills.  It just seems that you only have to attend a certain number of skill classes to earn one.  I never counted the exact number but have had a lot of sims earn one.  I think it is by design but it doesn't make a whole lot of sense how you earn it.  I would think that it would make more sense coming from attending mixology skill classes rather than a random bunch of classes and that you could earn one for the other skills as well.

I have the same issue. she has never learned mixology skill. She didn't have a chance to learn it but she earned the specialist certificate. I wish the sims who achieved at least level 5 in mixology skill, can be allowed to get this. Because the sims can head start from level 6 in Culinary bartending branch with this certificate. It doesn't make sense my sim can head start with NO Mixology skill.