Summary:

A parity issue, the Bedrock Edition player is unable to use the Java Edition tool that allows you to fly in and out of water 

Steps to Reproduce:

1. Launch Minecraft Java Edition
2. Equip elytra wings and pick up rockets
3. Go to the sea and start pressing space on the surface of the water 
4. When you start flying, use the rockets to gain momentum and fly into the water 

Observed Results:

Unable to start a flight and fly under water in Bedrock edition of Minecraft

Expected Results:

In the Bedrock edition of the game, it should be possible to use the same feature, making the player able to fly in the same way.

Screenshots/Videos Attached: Yes