Hold the use key while holding the trident with the riptide enchantment. After waiting long enough, release the use key and press the swap hands key at the same time.
If the timing is right, the player will launch under the effects of the riptide enchantment without losing any durability on the trident.
Same thing happens for ghost items created with MC-154881. This will be much easier to reproduce.
Thank you for your report!
We're tracking this issue in MC-187015, so this ticket is being resolved and linked as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.
Quick Links:
📓 Bug Tracker Guidelines – 💬 Community Support – 📧 Mojang Support
📓 Project Summary – ✍️ Feedback and Suggestions – 📖 Game Wiki