When using an anvil in the most recent snapshot, your items disappear. For example, if I attempt to combine two books, I will click on the output but the two books as well as the experience is taken, while no new book is created. I tested this on 15w43c and anvils worked correctly.
MC-91579
Anvil Bug
Resolved
Duplicate
0
Thank you for your report.
However, your ticket has been resolved as a duplicate.
This issue has been linked to the original bugreport: MC-91521. You can find or add further information on that report.
Please search before reporting any bugs, as it's likely that one exists already.