Items smelted in a furnace may not stack or be used in composters etc

The composter no longer accepts baked potatos after 1.12 update on both the xbox one and windows 10 versions.   I found the issue because I have a machine which is a chest that dumps raw potatos in to ovens and then into composters and drops bone meal into a chest.  I noticed it was not running.  The hoppers were full above the composters and the composter were  not accepting baked potatos.   So I made a new composter and put in raw potatoes and it turned them in to bone meal.  I then tried to put in baked and it will not take them.  Please don't tell me this is a new feature.   we need the bone meal for our sugar cane machine.