Should custom validators work for Prisma composite types?

[timfenton-dermi]

Hey great work on this by the way!

Just wanted to see if this is working as expected or not:

type OrganizationContact {
  contactIdentifier String? @default(uuid())
  firstName         String
  lastName          String
  email             String
  // e.164 formatted phone number
  phoneNumber       String? /// @zod.import(["import { validatePhoneNumber } from '../../../custom/phoneNumberValidation'"]).custom.use(z.string().refine((val) => validatePhoneNumber(val)));
  role              String?
  isPrimaryContact  Boolean @default(false)
}

Context:

OrganizationContact is a composite type, not a model.
phoneNumber has a custom validator on it that is importing a custom function and using it to do some validation.

Expectation:

npx prisma generate would result in the following for phone number:

phoneNumber: z.string().refine((val) => validatePhoneNumber(val)).optional().nullable()

Reality:

npx prisma generate results in the following for phone number

phoneNumber: z.string().optional().nullable()

is this expected behavior because it is a Prisma composite type, or is this a bug?