Water doesn't work as intended if used with glass panes and fences

I'm not sure if I'm the only person experiencing this but water doesn't work the way it should. If you place water in the middle of a 6 x 6 glass pane box, it won't flow and fill the air pockets. Placing it on the block only makes it flow through the glass. If you try to make water flow through fences, it won't go in the gaps and pass through it