Schema validator doesn't resolve default values for nested defs

[MayberryZoom]

Working on #369 I encountered this issue trying to write schema for actor layers:

"actor_reference_with_layer": {
    "type": "object",
    "properties": {
        "scenario": {
            "$ref": "#/$defs/scenario_name"
        },
        "actor_layer": {
            "$ref": "#/$defs/actor_layer"
        },
        "sublayer": {
            "type": "string"
        },
        "layer": {
            "type": "string",
            "default": "default",
            "deprecated": true
        },
        "actor": {
            "type": "string"
        }
    },
    "required": [
        "scenario",
        "actor"
    ]
},

"actor_layer": {
    "type": "string",
    "enum": [
        "rEntitiesLayer",
        "rSoundsLayer",
        "rLightsLayer"
    ],
    "default": "rEntitiesLayer"
},

This defaulted layer as expected, but actor_layer ended up receiving no value (tested with actor patcher):

{
    "actor": {
        "scenario": "s020_magma",
        "actor": "trap_thermal_horizontal_004"
    },
    "new_reference": {
        "scenario": "s020_magma",
        "actor": "trap_thermal_horizontal_custom_000"
    },
    "modifications": [
        {
            "path": ["vAng", 2],
            "update_to": 3.14159
        }
    ],
    "make_copy": true
}

original_reference = {'actor': 'trap_thermal_horizontal_004', 'layer': 'default', 'scenario': 's020_magma'}
new_reference = {'actor': 'trap_thermal_horizontal_custom_000', 'layer': 'default', 'scenario': 's020_magma'}
modifications = [{'path': ['vAng', 2], 'update_to': 3.14159}], actor_groups = []
make_copy = True

Copy pasting the actor_layer definition into where it was being referenced will default as expected, leading me to believe this has to be caused by nested defs.