I had the geyser version of this happen to some mat that I had targeted when it fell into the geyser, I was lucky enough to see it disappear off the radar going almost straight up where it vanished out of range. Some time later I was heading back to the ship and saw a mat lying on the ground nowhere near where I had see one heading for the stars.If it's something I actually care about, I try to find it in the contacts menu so I can get it targeted and figure out where in the high-explosive double hockey sticks it flung off to.
If it's something that's a dime a dozen, it's a case of okibyeee and just grabbing the next one.
Point being your missing mat is probably not going to stay in the few hundred metres range of your sensors.