Mannequin with model-property specified, shows Steve skin

When spawning a mannequin with model set to wide explicitly, it shows steve skin on the player. Same as if model is anything other than slim
Skin here is a PNG of my player-skin in a custom resourcepack located in assets/minecraft/textures/skin.png
Tested with:

/summon minecraft:mannequin ~ ~ ~ {profile:{texture:"skin"}
/summon minecraft:mannequin ~ ~ ~ {profile:{texture:"skin",model:"slim"}}
/summon minecraft:mannequin ~ ~ ~ {profile:{texture:"skin",model:"wide"}}