Bug
looking up shoots down and looking down shoots up.
This is a new bug only found on 5.6 Beta 7, and happens with both bullet entities and raytraced bullets.
The angle the gun model points the correct direction but the bullets appear to shoot out at the reversed Y of where you look.

To Reproduce
Steps:

1. Take any mounted MG and place it on a block.
2. Have a large wall to aim at and shoot at it while looking up and down side to side.
3. Watch as you aim up and down the bullets will shoot out of the reversed angle Instead of following the aim point of the gun.

Screenshots

This screenshot shows me looking down and firing the mounted MG, the bullets go up instead.
I changed the gun to have a slower bullet speed to make it easier to show the bullets hit box going the wrong way.

Versions

• Forge: forge-1.12.2-14.23.5.2838
• Flan's Mod: 1.12.2-5.6.0-beta.7

Additional context
This bug is new to the mod all previous versions the bullets of MGs went where you aimed.

I'm having the same problem I believe... #1287