New Feature *Fire*

So after the update i started testing the new features and i came across the a bug with fire. I basicaly tried placing fire on a sandstone block and it appeared half fire half a dark block (kinda as if the image wasnt processed properly in the game or something of the sort) and it carried on happening when i burned a tree and when i when i burned a grass block too it just wouldn't appear as it normaly should. I managed to solve this issue when i exited the map and entered in again, i dont seem however to be able to trigger it again otherwise i would add a screenshot but the method to this was simple i used flint and steel on a sandstone block the grass and then a tree.