Found a dupe glitch in windows 10 beta edition minecraft also have 2 other bugs I will address.

1st is the dupe glitch

Was cool but it glitches out the furnaces where you can't use them until you completely reload the game. To reproduce this.

Open furnace
Put desired dupe items in the top left box...close furnace...go to main menu
Reload game and take desired items out of furnace
Turn around and place 3-5 blocks anywhere on the ground....leave game...do not click the x just pause and go to main menu
Reload game...check furnace and the amount in inventory should be the same as in furnace...thus duping it.....and that's it all I could figure out about this one....also it glitched once and took the items I tried to dupe...idk

The next glitch occurs in my game at least..I have no idea how to reproduce it but...imagine my inventory is full of cobble....also hand inventory is full of tools....if you break a chest it should not pick it up correct??....well in my case it does and I have no trace of me ever creating it....so idk about this one...that's all I know

The 3rd and final is universal....it works on xbox and pc as far as I know...anyways if you have gravel fall on you you suffocate...that is obvious but if you look in 3rd person at your charactor it appears to have gravel where his/her pants should be..and you have to jump to get out of this...this is easily repeatable...first wall your charactor in with cobble or something like it and place one cobble about 2-3 blocks above you...place at least 3 blocks on top of that cobble and proceed to stand under them...break the cobble and avoid death by suffocation by breaking the block and then you can break everything around you so you can see....but it should glitch you inside the block

This is all I have experienced in this game...and I'm sorry i didn't want to make 3 separate bug reports...it's more convenient this way...if you need any additional information do not hesitate to contact me