[GRO] Cannot practice standing/Tummy Time in basements

This has been going on ever since I have been playing again so I am reporting it now as it is a real pain in the rear. When a sim is holding their toddler and tries to start tummy time as seen in the photo, an error message shows saying, "You can't do this in water". I used to think it might be the house they were living in, but it has been consistent across houses. 

Since it won't work this way, my sim has to put the toddler down on the playmat and then initiate tummy time by clicking on the playmat. This is a HUGE pain because my household is so busy that in the short time between putting the child down on the mat and then choosing tummy time as a separate interaction, something can distract my sim in between that short time. And there is enough hang time once a sim decides to do something that they might be halfway across the house before whatever I told them to not do cancels, and they have to walk back again. it is not as bad timewise with my vampire sims as they can get back quite fast, but they're also gone faster. There is just no reason for it when I obviously should be able to initiate the tummy time while they are holding the toddler. Please fix this!!!

I started using mccc again yesterday, but the problem goes on in a clean game too because as I said, it's existed since I restarted playing.