I'll take this video of Lü Xiaojun as a reference.
Let's consider the power phase, that is the moment I'm curious to understand better.
At this point, his hips and the bar are very close to each other and both are close to the midfoot. I'd say that this allows him to be balanced around his midfoot.
Now, let's see the next moment.
In this picture, his hips are, as before, slightly behind his midfoot, whilst the bar is much more forwards than before. How can he be balanced?