Fence duplicates when doing a lot of weird stuff look at pictures

step 1 make a construction with a piston a carpet and a 1 tick clock

step 2 place the carpet bitween the carpet and the piston on the right time to get ''flying carpet''

step 3 make a construction [fence-flyingcarpet-piston]

step 4 leach a animal to the fence post

step 5 power the piston

step 6 unpower the piston

step 7 you got a duplicated fence post and the flying leach thingy will disseapear in 2-3 seconds

it works with nether fence too