Summary:

In Minecraft Java, the area to get the water source in bucket is it´s entire block. In Bedrock Edition, the area to get water source is very small

Steps to Reproduce:

1. Launch Minecraft Java and Bedrock Edition
2. Place water source with a bucket above you
3. swim in the water and try to catch the fountain with the bucket

Observed Results:

In Java Edition, the area you can catch water is equal to it´s entire block, while in Bedrock this area is much smaller. For mobile players, it sucks to try this, as you have to go forward while climbing and trying to get water all at same time, with big chances of mistake, needing to try it again. Due to how java works, it is much easier to climb locations using a bucket of water, which is not very easy in Bedrock edition

Notes:

In Bedrock Edition, the character will only get water when close to the surface. 

Screenshots/Videos Attached: Yes