Game Version:
Platform: (Steam windows
The bathtub for small children has a hole in it.
Clipping with furniture is an issue, and only appreciated in one circumstance (crowded businesses when you want to stock the shelves and can walk through them when people are in front 
).
But in general, it’s an issue that needs addressing for all surfaces, including walls. Zois will stand in a wall or sofa, etc. if they’re taking a photo of someone in an interaction and there wasn’t enough space for them to step back without colliding.
I’m hoping they can figure this out so zois will move to appropriate places where there is enough room. The baby bath situation must be caused by the baby’s natural sitting posture. So, the best fix would be for babies to sit with their legs tucked in more.
Sure, real life toddlers don’t sit cross-legged much, but it would be a solution to this clipping that is probably easier to solve than other clipping such as walls and larger furniture, etc.
Would it be enough to remodel the bottom of the bathtub?
I can understand passing through walls. However, it’s better than having sims get stuck in narrow passages like in The Sims 2.
I’m sure that would be the easier solution! Silly me.