Infant not sent to daycare if on playmat when adult sim leaves

I'm having  a similar issue in a no mods/no CC game. It's not tied to the playmat, however - sometimes the infant goes to daycare fine from the playmat, and sometimes they don't go when they are somewhere else. I can still have the infant interact with objects at home like normal, but, with no adults home, have no way to help their decaying needs.