I'm also having this issue, got to the second set of mirrors in the thread breaker section and the mirror on the right closest to where you spawn doesn't work. I assume this broke after the Arc 3.0 update as I completed the campaign on another character previously. Have tried going to orbit and reloading and it's still broken. Also playing on Legendary if that's relevant
Edit: ok so i managed to fix it by sliding into the mirror, not sure if thatll work for everyone
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sliding solved it for me
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Had the same problem it worked for me