Game exits sneak mode when placing block. I use sneak mode to build stuff without falling off in survival mode, and having access to use of sneak to build objects is very, very crucial, and building without it is exceptionally difficult, do damn near impossible. I spend a lot of time building in Minecraft, and without this I can't build... Furthermore I think it's self defeating to ask players to switch to creative mode just to build stuff... This feature severely impacts enjoyment of the game, especially since I build mainly in survival mode, and changing to creative really defeats the purpose.