Email sent without body text (Empty mail content)

Hello,

I have tried many times, but the transaction mail(password reset) generated don’t have body text included, only the header and footer is presented there.

I am using WP_MAIL_SMTP to send the mail. IF not activating EMAIL TEMPLATE, it will send out with plain text only email with the correct body text included. However, if activated EMAIL TEMPLATE, then only header and footer is presented, there is no body text in the mail.

Please kindly help, thank you.