Yes, recommended to replace 11 and 12 speed chains at .5%. Doesn't mean that is the issue of your problem though and I doubt you'd notice shifting issues at less than .75% wear.
I have found that contrary to many comments on chain rings wearing out on 12 speeds when I do this they last a very long time. The 12 speed cassettes are very expensive, I'll go with changing my chain at .5% even if it "might be fine".