Summary:

In Minecraft Bedrock edition the player's left hand is invisible and you can see this by following these steps

Steps to reproduce:

1- Take any map (treasure map, empty map that can be filled)

2- If you took an empty map, fill it.

3- Place the treasure map or a completed map in your left hand.

Observed results:

You will notice that the player's left hand does not appear. It looks like the map is floating.

Expected results:

There should be a left hand picking up this map, just like in Minecraft Java edition.
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I left some pictures of the different editions, so you can see the difference.