Even tho hitboxes of panes have been changed the corner 3 panes is missing a column of pixels. Panes that are connected to walls or against another pane are a pixel smaller than they might seem to be (which was fixed in 1.9) and correctly reimplemented, HOWEVER because of this a corner of 2 such panes causes a missing column which has not been reimplemented
Even tho hitboxes of panes have been changed the corner 3 panes is missing a column of pixels. Panes that are connected to walls or against another pane are a pixel smaller than they might seem to be (which was fixed in 1.9) and correctly reimplemented, HOWEVER because of this a corner of 2 such panes causes a missing column which has not been reimplemented