LINE's messaging API provides an API to get clicking count by URL. It never count auto-preview request. https://developers.line.biz/en/reference/messaging-api/#get-message-event
Thanks for your reply! Good to know that LINE doesn't track the click with auto-preview request. But I'm doing a custom solution that using code to track the access to the URL, which is inaccurately treating the click from the LINE user when the URL is auto-previewed.