Summary:

There is also a difference in the Wither Boss being killed between Minecraft Java and Minecraft Bedrock.

Steps to reproduce:

1- Summon the Wither Boss with four soul sands and three wither skeletons heads.

2- Place the four soul sands in a «T» shape with two vertical blocks and the rest on each side of the last vertical block. Thus making three horizontal blocks.

3- Then you place the three heads of wither skeletons in the three horizontal blocks, and so the Wither Boss will be summoned.

4- This step is more complicated and time consuming. You must kill the Wither boss (You can also kill with the command «/kill @e [Type= wither] » that the Wither will also die).

Observed results:

In Minecraft Bedrock you will notice that the Wither Boss when he dies he turns all white, but he keeps moving like he's going to explode. And in the end it explodes. I don't like it because the explosion kills the player and is very disruptive.

Expected results:

It should be the same as Minecraft Java. The Wither Boss isn't all white, it's the normal color but kind of like a bluish transparent shield. It doesn't explode either, it just dies immediately.
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I honestly prefer it as it happens in the Java edition. No explosions on the Wither Boss's death and no weird all-white coloring. If you can, you can make the Wither Boss death in Minecraft Bedrock look like Minecraft Java. I left some videos there so you can see what happens.