Appointments + HTML Emails Not Working after activating option.

Hello,
I have read through the other tickets of similar nature and you give the same answer over and over to people having issues with html emails. Just go to the add-on section and activate html emails, I have done this but doing so disabled all the place-holders from working.

"For the above email subject and message contents, you can use the following placeholders which will be replaced by their real values: SITE_NAME, CLIENT, SERVICE, SERVICE_PROVIDER, DATE_TIME, PRICE, DEPOSIT, BALANCE, PHONE, NOTE, ADDRESS, CITY, EMAIL (Client's email) , CANCEL (Adds a cancellation link to the email body)"

Is there a way to use html emails and still use placeholders?