Bug or Expected Behaviour: Tip Embeddable does not Render in Email

When using a tip from the insert menu, it is rendered as plain text

Pardon the testing to see how this platform handles it vs my test upgrade to

In my instance, the email for Forum Thread which hasn't changed in several updates, renders the tip as plain text of the content of the tip and does not indicate it is a tip at all. Is that expected or do I have something wrong/out of date on my instance?