I'm wondering what everyone's experience has been with their bp's pooping while soaking?

I gave Tigerlilly a nice long soak tonight because she's very blue. This is probably the 5 or 6th time I've given her a soak, but she's never pooped while soaking.

Slinky, my BCI, is the exact opposite, I get her close to any body of water larger than a coffee cup and she poops.

Just wondering how everyone else's bp fair?