Hey guys, I just picked up my (new to me) 2019 lariat fx4 and I’m in love with it!! Such an awesome truck, also my winter/work car, my other baby is asleep in hibernation (18 c63s coupe amg), this is my very first post so hello to everybody!

So my concern is that I noticed in between the truck bed and cabin there is some sort of felt/fabric coming loose, and I am worried debris and road salt going in there and causing rust.. anybody else experienced this issue, and is there a fix? I just don’t see how anyone would be able to squeeze in there.. any help/insight would be appreciated.. thanks everyone
Here are some pics (of my truck &#128512
and of the problem