If you put the new carpets around an enchantment table it keeps you from getting level 30 in the enchantment table
Linked issues
Comments 2
Duplicate of MC-2474, please use the search function to see if your bug has already been submitted. Currently over 56% of tickets are being closed as duplicate.
This is because the carpets occupy the space between the bookshelves and the table, like a torch, snow, redstone, etc. would. Whether or not this is intended with the carpets, I'm not sure, but I'm leaning toward yes. Sure would be nice, though.