Reassigned 'Toggle Perspective' F5 Key Changes Perspective when Typing

^{Update by [Mojang] Mega_Spud (Jay Wells):}
Summary:
When the 'Toggle Perspective' key is reassigned to another key, it will change the perspective whenever that key is pressed, even if typing in chat or a command block, for example.

Steps to Reproduce:

1. Reassign the 'Toggle Perspective' key to U
2. Open chat and type U

Observed Results:
It types the letter, but also changes the players perspective

Expected Results:
It shouldn't only change the perspective if the player is typing into chat (or any text field)

Screenshots/Videos attached: Yes

Notes:
Affects any text input field, including Command Blocks, Inventory search, signs etc, as well as the pause screen.

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Original Description:
Let's say I have F5 binded to R, if I'm in chat, and whatever word I'm typing happens to have R in it, it changes my view perspective even though I'm typing something in chat.

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If this issue is a duplicate, sorry, I don't know what I should be looking for since this is a very specific issue.
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EDIT: This isn't just a bug w/ chat, it happens in the inventory also
, while on the pause screen, everywhere!!