[Briefly describe the bug here]

I dont fully understand what you guys mean by "reproduce" but this is my take on it.

Steps to Reproduce:

1. Click on a random world.
2. Press escape, Then press the settings button.
3. Find the Keyboard and Mouse button and click on it.
4. Scroll down to Drop Item, And right beside it, it should say "Q"
5. Click the Q and click a mouse button on your mouse.

Observed Results:

When you try to remap the drop button to a side mouse button it dosent work anymore.
Expected Results:

When you click the "Q" and then click the mouse button it should remap and the Q should say button 16 or somthing like that.
Screenshots/Videos attached: (Look in attachments)

Notes: