title: Woocommerce email variables not working
body: <p>I am using Woocommerce emails variables as refered here: <a href="https://docs.woocommerce.com/document/automated-follow-up-emails-docs/email-variables-and-merge-tags/" rel="nofollow noreferrer">https://docs.woocommerce.com/document/automated-follow-up-emails-docs/email-variables-and-merge-tags/</a></p>
  
  <p>I've added the variable {customer_name} to my e-mail template title, but it doesn't get processed and still shows the same slug in the email I get. </p>
  
  <p>Using the variable:</p>
  
  <p><a href="https://i.stack.imgur.com/5UOky.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/5UOky.png" alt="enter image description here"></a></p>
  
  <p>Result in e-mail:
  <a href="https://i.stack.imgur.com/xQbrb.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/xQbrb.png" alt="enter image description here"></a></p>
  
  <p>What do I need to improve?
  Best wishes</p>