Description
This is related to #2145 as it is happening the same problem.
The Post: Link type does not work on my local site (not online yet), so I went to try your site, going to the "Post: Link" here: https://mmistakes.github.io/minimal-mistakes/year-archive/ and it does not work as well.
It is weird because the tag is there for the text title to be linked to github.com, but clicking anyware in the area of this post links to the inner post and not to the link to github.com.
I noticed that removing the rel="permalink" attribute of the second tag (from the icon) kind of solcves it (makes title going to github.com, the link icon going to inner post), but it should work without having to remove it.
I tried with up to date firefox, chrome and brave on Ubuntu.
Also trying with up to date Android (firefox and chrome) and iPad (safari and chrome) does not show the link icon, but clicking the title goes to inner post anyway.
Again, note that I did the testing with your online site.
I get from related issue that this could have something to do with the browser itself, but it is weird anyway because I am having same problem with major browsers on several platforms, so it might be something else that we could look at to solve it.