I've encountered a similar problem before. Typically, this can be fixed by checking if the game properly registered your completion for the third encounter. Sometimes, logging out and then logging back in can help update your progress. If that doesn’t work, reaching out to the game's support team is usually the best next step. By the way, I love this raid too! I recently came across an in-depth guide that I found really helpful: destiny 2 pantheon - [url=https://wowvendor.com/media/destiny-2/pantheon-guide/]wowvendor[/url]. Maybe it will help for future runs!