Nested component with if weirdness

[Conduitry]

Apologies for the vague title, but I don't know how to distill the problem I ran across any further. The REPL seems to be acting wonky with multiple components currently, so I've created a failing unit test instead. Branch incoming.

[Conduitry]

As the bug is identified better, perhaps the unit test can be refined as well. Right now it doesn't have any asserts, as simply doing the two .sets in it throws an exception.

[Rich-Harris]

Fixed in 1.22