Some icons in Jquery UI 1.12 have changed slightly their position?

Some icons in Jquery UI 1.12 have changed slightly their position?

I'm upgrading from version 1.11 to 1.12 and I noticed that in the stylesheet definition some icons changed their location on the sprite 1 pixel. For example:

Now:
.ui-icon-triangle-1-s { background-position: -65px -16px; }

Before:
.ui-icon-triangle-1-s { background-position: -64px -16px; }

Now:
.ui-icon-arrow-1-s { background-position: -65px -32px; }

Before:
.ui-icon-arrow-1-s { background-position: -64px -32px; }

Other position changes involve ".ui-icon-caret-1-s" and ".ui-icon-arrowthick-1-n"