Please let us see either the repo or a live website with this phenomenon. From the description, both links should work identically. But what could be is, that you have a JS library in use that is having difficulties to discern between its own links and the hashtags in the URL. Some libraries use the hash for navigation purposes (dynamic loading of content) and will disable the action of the browser.
actually “turbolinks” is a trigger word I know some themes that depend on that plugin and they won’t work either… The thing is that the plugin is no longer developed, so… yeah… deprecation…
On the other side, as far as I understand the plugin you can safely remove it and things keep working. They won’t just stay as “fast” as turbolinks was doing the site before.