Step 1: Go in creative mode.
Step 2: Cook something in the furnace
Step 3: Ctrl + middle mouse click to copy the furnace with nbt
Step 4: Place it down somewhere else and notice that it isn't animated while it continues cooking.
What I expected was the animation started when I placed it, even after a while when some check happened...
Hey there!
Just to let you know, this issue has already been reported and is a duplicate of MC-48453