I picked up Legend of Acrius last season after sitting on the quest for the past 3 years. I shoved it into my vault and pulled it out a few times to complete catalyst quest steps (i never completed the catalyst quest) and I never got the triumph for acquiring it.
https://i.imgur.com/kwFAU1D.jpg
It was on my character when beyond light launched and now I can't move it to my vault (in-game or using an app). The monument to lost lights also thinks I don't have the weapon, but it's right there!
https://i.imgur.com/G221KZM.jpg
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You still have the old quest version (which had 0 perks & only 1 shot), so it couldn’t be stored in vault or transferred to another character. You failed to finish quest to turn it into the full exotic. Now, that quest has been removed & the only way to get full exotic version now is via kiosk purchase.