Trident item is very small and renders as a 3D model when dropped or in an item frame

That's actually how the trident looked before it got an item model, which is supposed to apply to the dropped item form as well due to how odd it looks otherwise. This should be easy to fix as the cursed tiny spinning trident thing just has to be replaced by its superior inventory form.

Is duplicated by MC-161978.

Can confirm, Tridents also don't render correctly if you are using a Texture Pack that changes the display, this applies to first & third person view, item display both in ground and Item Frames, it seems like ignores the display properties and instead renders the Item as the Model and not the 2D vanilla texture or a custom version.

Can confirm, this is still an issue in 19w41a