I have the same problem.
My keyboard combination to switch layouts is Super+space. If I do:
1) Press Super 2) Press Space 3) Release Super 4) Release Space
...the keyboard layout isn't changed, the steps (3) and (4) need to happen in the opposite order for the layout to be changed.
So people typing fast can't use ibus to change layouts.
I have the same problem.
My keyboard combination to switch layouts is Super+space. If I do:
1) Press Super
2) Press Space
3) Release Super
4) Release Space
...the keyboard layout isn't changed, the steps (3) and (4) need to happen in the opposite order for the layout to be changed.
So people typing fast can't use ibus to change layouts.