Hello,
I don't know when this bug/glitch has began to occur. Could be before the Into the Light, or after it.
As of now, it's IMPOSSIBLE to solo the Warlord's Ruin Dungeon. When you defeat the first boss and get locked in the cage, the only way to leave you cage and go find the other locks is CLOSED. There are 2 doors overlapping each other, in the same place, one open and one closed, but since its the same door you get soft locked in a cage... Isn't that ironic....
I'm unaware if this problem has been reported previously, I tried to find something but I'm not familiar with this Forum yet. Sorry if this is a "repost" of a similar bug!!
I don't know how to upload a screen shot, but I tried my best... If it doesn't work, the TL;DR version is that you cannot leave the cage/puzzle area because the way to find the rest of the spinning locks things is closed when you try to SOLO this Dungeon.
Thank you for your time, and I hope this Bug Report is useful to solve this problem!
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While waiting for a fix you can still Solo clear the puzzle with Fighting Lion: https://www.bungie.net/en/Forum/Post/263835222/0/0 (΄◉◞౪◟◉`)