Yeah I asked to be sure, I got that it was a feature (and also read the description) but sometimes the platform just start floating so far from the bird that it is impossible to reach them.
It is not a big issue, I mean, I can just reload the game and everything works fine. I think it is just a little physics bug I've found (also, the console prints an error with some move_and_collide functions, could be linked to the bug)?
Anyway, I'll wait for the final version! :D