[BUG] Select component does not show placeholder

[AndyPye]

According to the documentation for the Select component’s value prop:

When not set, the value will default to an empty string, which will show the placeholder text as the “selected value”

However, I have a Select component in a full-page customer account UI extension, am passing an undefined value to it, and seeing that it doesn’t display the placeholder at all but instead shows the label of the first option that was passed in.

I’m using 2025.4.0 of both @shopify/ui-extensions and @shopify/ui-extensions-react. The following code provides a minimal reproduction of the issue:

import { Select } from '@shopify/ui-extensions-react/customer-account';

const SelectPlaceholderBug = () => (
  <Select
    label="Choose a value"
    placeholder="This should be shown"
    options={[{ label: 'This is shown instead', value: 'should-not-show' }]}
    value={undefined}
  />
);