Path alias and taxonomy term view
Normally the internal links /taxonomy/term/% are not used anymore, because all links Drupal puts on the page are aliased. If you want to prevent having multiple paths for the same page you can install https://www.drupal.org/project/redirect.
From the project page:


D8: Maintaining a canonical path and redirecting alternative URL's    like non-aliased path, path without language prefixes and so on
(Previously provided by Global redirect)