Since the latest update, personal avatar scalers like the Jackal scaling system and Mag's scale adjuster have been broken for the local mirror clone. This means that in mirrors or cameras, the scale seems to be getting applied twice.
It appears this has to do with constraints not running in the mirror clones.
Dexvoid highlighted a temporary workaround, although this is undesirable and also doesn't guarantee this will keep working in the future as the behavior will get changed again.
To make them work again for now there is a workaround to add source to the constraint on the armature that looks at the head bone with a weight of 0. This makes the local version be incorrectly scaled twice up as well, which then can be compensated by having all scale animations be the square root of the original value.
I've attached a couple images of the discord message, workaround fix applied to the constraint in unity, and a screenshot of in-game showing the issue. Here a scale of .4x has been selected. You can see the eye height is a little below the pool table, but in the mirror the local clone got a lot smaller than .4x