If you name an item in an anvil that can be placed such as cobblestone, placing the item and breaking it makes the item not named anymore. For example, if I named a torch, "The awesome torch", then I placed and broke the named torch, the name would be reset back to its default name.
Linked issues
duplicates 1
Comments 2
Duplicate of MC-209, please use the search function to see if your bug has already been submitted. Currently over 49% of tickets are being closed as duplicate.
that's because they don't support strings and it would be to much data, but it is a bug that renamed command blocks, furnaces, chests and hoppers don't keep their when you destroy them after you've placed them.