https://community.hackernoon.com/t/canoncial-link-missing-re...
I had this issue years ago, and even got into a Twitter argument with their founder. It was a bug. Not sure what is the cause now.
Here's more about how publishing and republishing on HackerNoon work:
https://help.hackernoon.com/republishing-guide
https://help.hackernoon.com/backlinks-guideline
https://help.hackernoon.com/editorial-guideline
https://help.hackernoon.com/for-writers
https://help.hackernoon.com/distribution
https://help.hackernoon.com/writer-account--perks
https://hackernoon.com/the-second-human-rule-9a1a3yhl
https://hackernoon.com/4-facts-you-should-know-about-republi...
https://www.publish.hackernoon.com/
https://hackernoon.com/how-to-retitle-republished-posts-gbn3...
https://hackernoon.com/hacking-hacker-noon-best-republishing...
Honestly, if you're using HackerNoon just to get canonical links, you don't understand the value of publishing on HackerNoon or other technology publication for that matter. It's about getting a free human editor and reaching people where they are.