[bug]: Calendar does not work properly with default form values

Describe the bug

When using the datepicker in a form and setting values or default values, the default value cannot properly be de-selected. When clicking on the same date, the regular behavior would be for the date to be de-selected however in this case, the date gets set back to the default value.

Affected component/components

DatePicker

How to reproduce

This can be recreated using the default form setup from the site, but adding a default value. When selecting any other value than the default, then reclicking that value to deselect it, the datepicker once again shows the default value that was set.

const FormSchema = z.object({
  dob: z.date({
    required_error: "A date of birth is required.",
  }),
})

export function DatePickerForm() {
  const form = useForm<z.infer<typeof FormSchema>>({
    resolver: zodResolver(FormSchema),
    defaultValues: {
        dob: new Date();
     }
  })

  function onSubmit(data: z.infer<typeof FormSchema>) {
    toast({
      title: "You submitted the following values:",
      description: (
        <pre className="mt-2 w-[340px] rounded-md bg-slate-950 p-4">
          <code className="text-white">{JSON.stringify(data, null, 2)}</code>
        </pre>
      ),
    })
  }

  return (
    <Form {...form}>
      <form onSubmit={form.handleSubmit(onSubmit)} className="space-y-8">
        <FormField
          control={form.control}
          name="dob"
          render={({ field }) => (
            <FormItem className="flex flex-col">
              <FormLabel>Date of birth</FormLabel>
              <Popover>
                <PopoverTrigger asChild>
                  <FormControl>
                    <Button
                      variant={"outline"}
                      className={cn(
                        "w-[240px] pl-3 text-left font-normal",
                        !field.value && "text-muted-foreground"
                      )}
                    >
                      {field.value ? (
                        format(field.value, "PPP")
                      ) : (
                        <span>Pick a date</span>
                      )}
                      <CalendarIcon className="ml-auto h-4 w-4 opacity-50" />
                    </Button>
                  </FormControl>
                </PopoverTrigger>
                <PopoverContent className="w-auto p-0" align="start">
                  <Calendar
                    mode="single"
                    selected={field.value}
                    onSelect={field.onChange}
                    disabled={(date) =>
                      date > new Date() || date < new Date("1900-01-01")
                    }
                    initialFocus
                  />
                </PopoverContent>
              </Popover>
              <FormDescription>
                Your date of birth is used to calculate your age.
              </FormDescription>
              <FormMessage />
            </FormItem>
          )}
        />
        <Button type="submit">Submit</Button>
      </form>
    </Form>
  )
}

Codesandbox/StackBlitz link

No response

Logs

No response

System Info

Runs the same in local and online environments.

Before submitting

[X] I've made research efforts and searched the documentation
[X] I've searched for existing issues

shadcn-ui / ui