Bug occurs while using the MW 1.37 release branch. This issue was not present on the MW 1.35 release branch.
When a link or linked text includes an anchor, this is cut from the displayed linked text. For example, this bug would apply to links such [[#Help]], [[Page#Help]], and [[Page#Help|#Help]]. The first link would result in no link being shown at all, the second would display the linked text as Page, and the third would again be invisible.