Puppies that are commanded to sit,Spawn to the area of the player when the pups grow to adults.

Step 1: I bred tamed wolves to get a pup.
Step 2: I command the newborn pup to sit.
Step 3: At sometime where the pup has grown,the grown pup spawns instantly near the player in a sitting position. It spawned to the player who is very far chunks away.(Any kind of pup even fully fed at birth will spawn to the player no matter how far the player is to the pup.) Although when I'm in the nether the pups don't bug out. Fix this and you save one puppy who spawned near the player when he was near lava.