I think that’s pretty much what FillFromCentre is, literally - in all directions, not to the right and to the left. I believe the intention here is to fill up in a radial way from the centre to the edge.
In order to achieve what you’ve demonstrated above, try placing 2 progress bars in a horizontal box and use left to right and right to left fills.
Not sure what to think about this one. I’ve always thought it was a feature but it might as well be a bug according to this post - have a look at the last couple of comments and the attached video.
You could fake the effect by setting Border Padding Y to something really high, like 2000: