Child Sim just sits there when playing in sand.

Hi! I've been wondering if anyone else has had this issue recently? Since I haven't really seen any threads or discussions about it. But whenever I go to the beach with a family or to the park, my infants, toddlers, teens and adults can play in the sand just fine and build sand sculptures. But when a child sim does it, they just sit there. They're still making progress in the bar and if they're building a sculpture it does get built.  But it's still very annoying.

I've tried playing with different households, different saves, both with and without mods, before and after patches and repairs. But it still persists, so it has to be some kind of bug. But if so, other people should ideally have it too?