You can update an item with NBSP from 1.19.4 to have a blank name
Use NBSP to rename an item in 1.19.4 and then update that world to the latest version (1.20 pre-4) to see that the name is now blank
Use NBSP to rename an item in 1.19.4 and then update that world to the latest version (1.20 pre-4) to see that the name is now blank