This may not be a bug, but rather a poorly described quest. Learn how to activate the ritual in Destiny 2 Tome of Want A ...

Map nodes that contain a Ritual Altar will have a red icon with a pentagram ... open the Atlas Passive Skill Tree with the top-left button, and then look to the bottom right of the Atlas tree.

The goal with Ritual is to farm Omens, raw Divine Orbs, valuable Uniques, and An Audience with the King. And while it is not as consistent as something like Breach ... a Ritual Altar will activate ...

identified by researchers as an altar, and a large standing stone (masseba), next to which ritual activity was likely practiced. One room’s floor displayed mysterious V-shaped carving marks ...