I think I would describe this as an example of hysteresis. Neat! https://en.wikipedia.org/wiki/Hysteresis

Interestingly, there are more use cases for hysteresis in UI design, e.g. it was famously used in nested menus in Windows: https://www.mackido.com/Interface/hysteresis.html

I think there was also an article about it on The Old New Thing, but I can't seem to find it anymore.