ajvConfigParams not respected in body validations

[robaca]

We created a custom format for phone numbers. As it is a function and not a regexp, I tried to pass it to Ajv via the following options:

   this.validator = buildSchemaSync(this.spec, {
            ajvConfigParams: {
                formats: {
                    email: emailValidator.validate,
                    phone: phoneValidator.validate,   // <-
                },
            },
        })

For request parameters, this is working fine, but when I validate arequest body with this format, it failing with the following message:

Error: unknown format "phone" is used in schema at path "#/anyOf/1/properties/phoneNumber"