Type Error with `getDescriptionAnnotation` and `PropertySignature.AST` in Effect Schema

import { Schema, SchemaAST } from 'effect';

const Foo = Schema.Struct({
  foo: Schema.String.annotations({ description: 'A string field' }),
  bar: Schema.Number.pipe(Schema.optional).annotations({ description: 'An optional number field' }),
})

const descriptions = Object.values(Foo.fields).map(field => SchemaAST.getDescriptionAnnotation(field.ast));