[BH] Several classes/lectures don't work

With the new Hobbies and Buisness pack, I have started a buisness where you can learn handiness and fabrication.

When you start a course with the whiteboard, one of the goals is to give a seminar of 45 min.

Starting a course on handiness and starting a seminar is no problem at all. Usually my sim automatically starts to give the handiness seminar.

But when I do the same thing for fabrication, I can't complete the seminar - goal. My sim will not automatically start the seminar & when I want to do this manually, the whiteboard gives the options on starting a seminar on rocketsience. This is then greyed out, because my rocketscience level is 0, obviously.

By the way, my sims level on handiness is 10 and fabrication is level 7. I have 4 woodworkingbenches and 3 fabricators within the range of the whiteboard. In both situations I have plenty visiting sims that want to participate in the course. I can give a participant an individual masterclass on fabrication and complete that goal from the course goals.

I am playing on the PS4 with all it's current updates. Therefore I have no mods. I am in the possession of hobby & business and Ecolifestyle and several other packs.