This issue was not present in 1.21.1.

The bug:

Throwing a trident that is not enchanted with Riptide does not increment the minecraft.used:minecraft.trident statistic, nor any scoreboard objectives using said statistic.

How to reproduce:

1. Execute the following commands in order to create a scoreboard objective tracking the times a player has thrown a trident:

   /scoreboard objectives add MC-278071 minecraft.used:minecraft.trident

   /scoreboard objectives setdisplay sidebar MC-278071

2. Give yourself a trident.
3. Throw the trident.
   → The objective does not increase.
4. Check the Items tab in your statistics menu.
   → The statistic did not increase.

Expected result:

Throwing a trident would count as a use for the minecraft.used:minecraft.trident statistic.

Observed result:

Throwing a trident does not count as a use for the minecraft.used:minecraft.trident statistic.