When the command: /enchant @a loyalty(etc.) is typed in, the 4 trident enchantments are not shown. Please see picture down below. Normally, you would be able to see all the enchantments, but they are not shown.
MCPE-31664
Command Trident Enchanting
Resolved
Fixed
1
NoobTubeInc
(Unassigned)
Confirmed
Windows
Windows 10
1.2.13.11
1.2.14.2
Retrieved
In beta build 1.2.13.10 was the same.