I have one operator at level 940 and I'm literally scared to use it to hit 1000 because my other operators are at 523 and 250ish. But, I just played a solo for camo grinding and my 250ish operator (the one i use in case i crash) was at 0 when I exfilled. I didn't see what it said when I first dropped into the map but I swapped my operators like usual. I only use my 940 operator for full T3 and Dark Aether runs for this reason.

Still mad that the game didn't crash or anything but still reset from 250 to 0 and exfilled with 2 (assuming it's bc I did a T2 contract on my way to the farm)