Multiple facets dependencies doesn't seems to work

Hi!

Imagine that we have 3 facets:

Facet A:
Value A1
Value A2
Value A3

Facet B:
Value B1
Value B2
Value B3
Dependencies: Active if we select A1 on facet A.

Facet C:
Value C1
Value C2
Value C3
Dependencies: Active if we select B1 on facet B.

No we select A1 on facet A, then we select B1 on facet B, so the 3 facets are active.
After this we uncheck Value A1 on facet A, so facet B disappears but facet C still visible.

This doesn't make sense.