Rolling back to WebStorm 2020.4 I find myself unable to open `README.md` at all. Other files open, can be edited, normal behavior. In the case of `README.md`, however, although the filename appears in the "breadcrumbs" bar, the contents never appear in their own editing tab.
This is not the same problem as https://intellij-support.jetbrains.com/hc/en-us/community/posts/360010516440-Can-t-edit-README-md , I am aware of how to toggle between Markdown states. The file does not open at all.