Incorrect Select input value being passed to NextJS Server Action

[YO-SC]

Hello everyone, I'm experiencing a peculiar issue involving the <Select> input component in conjunction with NextJS Server Actions. For some unknown reason, when the value prop of the Select input is an empty string ('') , it arrives as the first <SelectItem> on the server action (in this case 'light').

The frontend

'use client'

import { someAction } from '@/app/actions'
import {
  Select,
  SelectContent,
  SelectItem,
  SelectTrigger,
  SelectValue,
} from './select'
import { useState } from 'react'

export default function SomeForm() {
  const [theme, setTheme] = useState('')

  return (
    <form className="flex gap-4" action={someAction}>
      <Select
        name="someSelect"
        value={theme}
        onValueChange={(value) => setTheme(value)}
      >
        <SelectTrigger className="w-[180px]">
          <SelectValue placeholder="Theme" />
        </SelectTrigger>
        <SelectContent>
          <SelectItem value="light">Light</SelectItem>
          <SelectItem value="dark">Dark</SelectItem>
          <SelectItem value="system">System</SelectItem>
        </SelectContent>
      </Select>

      <button type="submit">Submit</button>
    </form>
  )
}

The server action

'use server'

export async function someAction(formData: FormData) {
  console.log(formData)
}

The output of the log is:

FormData {
  '$ACTION_ID_2068b0f2a20c130610cd5b9288dfffea606590ee': '',
  someSelect: 'light'
}

I don't know for sure if this is a shadcn/ui issue, a NextJS issue, or something else. Setting the value to undefined does appear to correctly display the selected theme on the server action. The challenge here is that since some of my <Select> components are not marked as required, I need the value to remain an empty string when it arrives at the server action.

I appreciate any leads, thanks.

[YO-SC]

Doing the following seems to do the job, but its not ideal.

value={theme ? theme : undefined}

Plus, I wanted to spread some awareness since I don't know if this is the intended behaviour

[YO-SC]

Oh, and for context, my Select component is the one found on the documentation. I did the manual installation.