I use keyboard and mouse on my PS4 to play Minecraft and I have found a bug. When I am in a menu let's say crafting or just my inventory, if I move my mouse as I exit the menu my camera faces straight up or down. So basically if you move your mouse as your exiting the menu your gonna be looking straight up or down, depending on if your moving your mouse down or up as you exit the menu.
Thank you for your report!
We're actually already tracking this issue at MCPE-85000, so I will resolve and link this ticket as a duplicate.
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