Tridents enchated with Riptide do not remain in inventory when thrown. This is a feature in the Java edition. The lack of remaining in the inventory makes the inability to cross enchant with all other Trident enchantments unnecessary. This also making Elytra travel during rainstorms with the a Riptide Trident useless since you would immediately lose it.

The attached video shows me using my Riptide III enchanted Trident and it bring thrown from my inventory instead of remaining in my inventory.

I did at first think this was a feature and considered making a Reddit post asking for this to be added but then decided that it seems more like a bug than a missing feature. If I am wrong and this is an intended feature feel free to close this and I will go to Reddit and make a post on how this should be added.