Links from the text of an era or timeline event, to other timelines and/or timeline events, do not render when viewing the timeline, instead showing the raw [timeline] or [history] tags. Other links, such as to characters, locations, and items, work perfectly well.
The same timeline and timeline event links that don't render when viewing the timeline do render when viewing the timeline event as a tooltip blurb or article, as well as in the sidebar editor view when editing the timeline, so the issue seems confined to the overall timeline view.
Tested in Chrome just to be sure it wasn't a strange Firefox issue; it happens in both.
Issue visible in the first event in https://www.worldanvil.com/w/shadow-s-call-loz-au-aliathena/t2/flood-timeline-timeline, "Zelda Melodia Rewinds Time"
The same links, on the same timeline event, working correctly can be seen in https://www.worldanvil.com/w/shadow-s-call-loz-au-aliathena/a/aura---mortal-person
Should be fixed for some time, last month we fixed it, I am closing the bug :)