Not exactly sure how its contributing to the error but I noticed that in the one you sent, the embedded gists are single files:

<script src="https://gist.github.com/alfianlosari/7d77730b0df9365881811c6875df220e.js"></script>

whereas in the one I sent there are multiple files in a single gist:

<script src="https://gist.github.com/deepakshrma/78b8a14940b17ffaff159d3188754597?file=01-val.py.js"></script>

Haven't checked other articles for this same occurrence but that seems to have something to do with it.

Gists embedded in Medium articles cause the following error:

The resource from “https://gist.github.com/deepakshrma/78b8a14940b17ffaff159d3188754597?file=06-val.py.js” was blocked due to MIME type (“text/html”) mismatch (X-Content-Type-Options: nosniff).

Example: https://scribe.rip/@deepak-v/validations-in-python-using-metaprogramming-and-decorators-advanced-python-ee4d4278a6b3