Anet didn't fix kitten, I tried today to complete that acclaim reward and after the strike it's still marked as incomplete in the vault... so I guess their "fix" has just locked me out of the reward entirely because I had it bug out before.
Stuck here as well. Come on, an old lws3 achievement shouldn't be impeding the progress of a fresh new one no matter what step the old chieve is sitting at. 😕