Shareable discount links keep discounts for more than one purchase

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I noticed strange behavior in shareable discount links. We have an app that generates one-time usage discounts. When a customer uses a shareable discount link, purchases (with the discount code that was auto-applied), and then goes back to the site to create another purchase, the customer see the following error: 


I was able to repro it in more than one store.


Is it a bug? 

Is there a workaround? Can I remove the applied discount from the cart somehow so customers won't see this error?