It is recommended that you always exclude an unnecessary item from the front end. If not, you can delete the last item before sending the request data to Validator.
$requestData = $request->all();
$count = count($requestData["event_time_start"]);
unset($requestData["event_time_start"][$count-1]);
$validator = Validator::make( $requestData , [
'event_time_start.*' => 'required',
]);
C2486 source
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