I’ve had this issue as well. I can tell from going to the developer console, that I can only see this:
Other than that, I had " DevTools failed to load SourceMap Could not load content for bla bla bla: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE" for several of my official plugins.
However, this is a issue in Chrome DevTools: https://superuser.com/questions/1523427/google-chrome-devtools-failed-to-parse-sourcemap-chrome-extension/1523842#1523842?newreg=c27cfa9dda0842d69df44e53ec42dfc2
An easy way to reproduce the problem for any developer reading this. Simply add this script into the House Ads and see if it shows up:
<script id="tcg-a2"
data-affcode="DuelistsUnite"
data-width="728"
data-height="90"
data-category-id="2"
data-campaign="affiliate"
data-source="DuelistsUnite"
data-medium="DuelistsUnite"
src="https://content.tcg20life.com/tcgafa.js" async>
</script>
There’s nothing wrong with the script itself. It’s an affiliate ad and it will show up in any regular html site. Something from Discourse itself is blocking it.