useTransition for routes

[sgneo]

Hello, I have two demos here: One with v8 and the other with v9.
The code seems to be the same, but the v9 one breaks,

v8: https://codesandbox.io/embed/jp1wr1867w
v9: https://codesandbox.io/s/focused-wiles-hy7kd?file=/src/index.js

Somehow in v9 we enter an infinite loop when changing a route.

I would appreciate any help here, thanks!

I'm not sure this is an issue so I posted it here.

[sgneo]

Update:
I've fixed the main issue by adding key to transition.
But one inconsistency still remains
On v8, When changing routes, the previous route is "A" and the new route is "B" for example.
on v8. When changing routes, the previous route changes as well so it looks like we travel from B to B.

v8:https://codesandbox.io/embed/jp1wr1867w
v9:https://codesandbox.io/s/focused-wiles-hy7kd?file=/src/index.js