[Field] Does not invalidate certain required controls

[mj12albert]

Bug report

Reproducible example

RadioGroup: https://codesandbox.io/p/sandbox/sweet-brattain-q9ptqr
Select: https://codesandbox.io/p/sandbox/eloquent-pond-cgnlg5

Current behavior

<Field.Root validationMode="onBlur">
  <Select.Root required>
    {/* the rest of the select */}
  </Select.Root>
  <Field.Error match="valueMissing">This field is required</Field.Error>
</Field.Root>

When there is no initial value (e.g. no defaultValue/value or defaultValue="") and the validation mode is "onBlur", Tabbing through the controls without making any selection doesn't not trigger the error

Expected behavior

Validate different types of empty values correctly

Base UI version

master & 1.0.0-alpha.5

Additional context

Only tried Input, RadioGroup and Select so far

[mj12albert]

A workaround is to use a validation function and match="customError":

<Field.Root
  validationMode="onBlur"
  validate={(value) => {
    if (value == null) {
      return "This field is required";
    }
    return null;
  }}
>
  <Select.Root required>
    {/* the rest of the select */}
  </Select.Root>
  <Field.Error match="customError" />
</Field.Root>