Yeah this was a change introduced in TTK (Destiny)

by Korny , Dalton, Ga. US. Earth, Sol System, Saturday, April 23, 2016, 05:10 (3230 days ago) @ Xenos

Can't remember if it was announced or if people discovered after the patch, either way it was a welcome change!

Yeah, that and Deathless were obtainable in Crucible after TTK, but it's pretty spotty. Maybe it has to do with certain weapons or something...