The bug
I know this is sort of due to the design of the mob, but when Drowned get ready to throw/when they are actively throwing tridents, they are throwing them bottom end first.
The tridents themselves fly and land point first, but the Drowned look like they are throwing them blunt end first. Not sure how you could fix this without the Drowned holding the trident upside down when they aren't throwing them? But I thought it was worth pointing out.
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Confirmed in 18w19b.
Still an issue in 18w20a
Affects 18w20b
Confirmed in 18w22a.

Affects 1.13-pre4.
Affects 1.13-pre6
Affects 1.13-pre7
This affects 1.13.1.
Confirmed in 18w16a. They can simply flip the trident when the drowned prepares to throw the trident, and flip it when they don't have a target. The flipping would only happen when switching from no target to preparing to throw, or vice versa.