Take a shulker box
rename it with an anvil
place it (name already gone)
easy as that.
Shulker boxes (all types) do not remember their name when being placed.
Renamed shulker box doesn't keep his name
Shulker Box Custom Names Doesnt Stay
Shulker Boxes lose their name when placed/broken
The Shulker Box Loses its Name When Placed
Shulker Boxes do not retain name when placed
Shulker Boxes don't retain anvil re-name when placed down or broken
Shulker boxes restore custom name after deleting it and placing them down