Falling off map right when relic reward pops results in black screen

[(XBOX)THE NTT]

And you are unable to see rewards, just the relic reward countdown timer.

I was host. Map was sedna grineer tile set - there is a tile with a ramp going across, stairs in the corner, and a mobile defense objective along one side. I fell off opposite the mob def target. (was a survival fissure mission just trying to describe the tile)

see video:

https://gamerdvr.com/gamer/the-ntt/video/164142207

by pure luck I got the rare part - but had no idea what I got until mission was over.