Zod schema mismatch from the contracts (missing .nullable())

[PeterMK85]

Describe the bug

Minimal reproduction
Example

OpenApi:

   Example:
      description: 'Array of daily data points [[epoch-millis, metric-value], ..., [epoch-millis, metric-value]]. Data quality issues can cause the metric value to be null.'
      additionalProperties: false
      type: array
      items:
        additionalProperties: false
        type: array
        minItems: 2
        maxItems: 2
        items:
          type: number
          nullable: true
          readOnly: true
        readOnly: true
      readOnly: true

Zod:

const Example = z.array(z.array(z.number()));

Expected behavior
Zod:

const Example = z.array(z.array(z.number().nullable()));

Additional context
It seems the generated type properly reflects the type

type Example = Array<Array<number | null>>