The Goat Horn, when tooting, appears positioned slightly differently when in the right and left hands. This can be seen in the attached photos. The photos are labeled via chat. Their center line is also marked.

This also affects left-handed skin mode, but with incorrect positioning in the main hand rather than the off-hand.

This can easily be fixed in the model data of tooting_goat_horn.json. Here, I've edited the left-handed visual to match the right-handed counterpart:

 

BEFORE:

"firstperson_lefthand":

{     "rotation": [ 0, 115, 5 ],     "translation": [ 0  , -2.5, -7.5 ] }

 

FIXED:

"firstperson_lefthand":

{     "rotation": [ 0, 125, 5 ],     "translation": [ -1 , -2.5, -7.5 ] }