Is this a glitch or intended? I think it is a HUGE let down when so many people like the Nord chant sound when the normal ones are summoned. I think the radiant apex should also get that chant as well I paid enough money. I hope its a glitch they will fix otherwise I'll be super disappointed.
I really doubt that it's a glitch/bug.
Radiants in this season simply have unique summoning sounds (which can be previewed when you look at all possible crate contents). Apex mounts are rather boring in this season (barely any special effects), so this "nord chant" sound is the only thing making them actually desirable