i've found a bug when playing with shadow in the boss battle of green grove act 2. the bug is that when i've defeated robotnik. the mobile was destroying, well, but i was still be able to homing attack robotnik, when i've homming attacked him with shadow, i've sticked to the mobile and i've was not able to get out, just some seconds and i've was out of the mobile. well, this happens with the bosses in general.
The homing attack disables in two occasions: when it hits something, or after a certain amount of time if it can't hit anything. As a defeated boss cannot be hit any longer, that is the result.
I never saw it as an issue, but I'll add a disable the homing attack event as a boss is defeated to prevent the floating from happening.