Did you find this on Strengthen? I can't find it in the incubator, it's one of those zombie sentences, that have been corrected in the incubator, yet they still appear on Strengthen.
Yes, unfortunately, these sentences are just there, for no apparent reason, since they've already been fixed or disabled (that's why we call them zombies.). It seems to be an issue, I hope we will be able to find a way for them to knock themselves out of Strengthen. Thank you for our comment ^.^
Well.. They might be around for a long time. :/ We can fix this issue ourselves. Hopefully, it will get resolved with the release of the new tree. Thank you for letting us know though^.^