Thanks for reporting the issue. I’m looking into it. Please don’t be alarmed in case you are getting a couple more notifications on Netlify while I’m trying to figure out what’s wrong.
Oh, I see, it was fixed recently, but hasn’t been deployed for Netlify yet.
https://github.com/discourse/discourse/commit/82a18f125f3581902e8e49c58411235cb05f386d
You might want to ask the admins of the self-hosted forum to update their Discourse as well.