Schema validation involving "dependentRequired" statements not working as expected

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I have the following schema which makes use of the dependentRequired statement:

const schema2 = {
    "type": "object",

    "properties": {
        "name": { "type": "string" },
        "credit_card": { "type": "number" },
        "billing_address": { "type": "string" }
    },

    "required": ["name"],

    "dependentRequired": {
        "credit_card": ["billing_address"]
    }
} 

pm.test("Validate dependentRequired Schema", ()=>{
    pm.response.to.have.jsonSchema(schema2);
})

The validation is expected to fail for the following scenario where the billing address is missing. This is also working fine when I test it with https://www.jsonschemavalidator.net/ but in Postman, the Test Result is always passing.

{
"name": "John Doe",
"credit_card": 5555555555555555
}

The only way that this works as expected is when I add the “required” statement after dependentRequired i.e.

const schema2 = {
    "type": "object",

    "properties": {
        "name": { "type": "string" },
        "credit_card": { "type": "number" },
        "billing_address": { "type": "string" }
    },

    "required": ["name"],

    "dependentRequired": {
        "credit_card": ["billing_address"]
    },
    "required": ["billing_address"]
}

But, doesn’t this defeat the purpose of using “dependentRequired”?