This happened in retail.
Here’s what’s supposed to happen: The player is put in a lightforged warframe suit that flies him down to the location where he is to click 3 portals and kill 60 demons using the vehicle’s damage abilities.
Here’s what actually happens: The player can run from portal to portal to click them, providing they are high enough of a level not to aggro the mobs. However, using any of the vehicle’s damage abilities within a second ports you back to the questgiver.
After about 15 cycles of this I had killed 6 mobs of the 60 I needed to kill. At this point I ran inside the building and was able to attack the guards one at a time as they spawned. The vehicle disappeared and I could just attack them using my class abilities.
I tried this quest today. The problem is that the warframe doesn’t have the hp scaling that it should. The vehicle is level 45 but has 396 health so it gets killed by any of the mobs that look in its direction, making intended route for this quest nearly impossible.
You can walk down to the area without the warframe and fight the mobs and it still counts for the quest.
This is a very recent change. It wasn’t like that last month.
And if they decide to fix it, they should also increase the turning speed of the mount, which was changed to “really stupidly slow” at the end of Legion, which makes it hard to maneuver around the fast spawning packs of mobs.
Edit to add:
I tried this on a level 45 tonight. It is not possible for a level 45 to kill the fast-spawning mobs unaided. I did manage to complete it by getting carried by a high level. They need to acknowledge that recent changes have restricted completing the Argus questline for no legitimate reason and undo whatever change has broken it.