Rockets lose "Flight Duration: 1" Data Name Tag when shift-clicked into enchanting table

Description

I accidentally shift-clicked a flight duration 1 rocket into an enchanting table. When I took it out, it no longer said "Flight Duration: 1" under Firework Rocket.

What should've happened

The rocket should've stacked with the others and still kept its Name data tag.

What actually happened

The rocket didn't stack with the others and it no longer said "Flight Duration: 1"

Additional Information

Placing the rocket into the enchanting table (instead of shift-clicking) makes it retain its "Flight Duration: 1" tag.