When I was experimenting with a selector system to change the spawnpoint of a player, I chose to use the new feature of item frames producing redstone current through a comparator. When I initially tested it out, I used a kill command to kill myself, to see if the spawnpoint change had worked. It did, however, when I went back to change the item frame rotation again, the frame and the item inside had frozen (I couldn't interact with the item frame or item inside at all), and only upon breaking the block behind it, did it break off into item entities for the item frame and item respectively. I tried dying again, only this time by natural means, instead of a command, and still the same issue came about.

I hope I've given a good description of this issue, and that it helps. Thank you for your time.