Since the even release of the Update Aquatic, i have never seen drowned spawning with enchanted tridents in Bedrock Edition.

This also trigger a inconcistency with mobs that are able to spawn with enchanted weapons/tools, because:

Zombies can spawn with enchanted swords/shovels.

Skeletons can spawn with enchanted bows.

Pillagers can spawn with enchanted crossbows.

Vindicators can spawn with enchanted axes.{}

Any mob that is able to spawn with armor has a chance of getting the armor with enchantments.

However, drowneds are not able to spawn with enchanted tridents.

Observed:

Drowneds cannot spawn with enchanted tridents.

Expected:

Drowned should be able to spawn with enchanted tridents.