It's NOT just a Proton thang! My left hand Drip Channel (??? Part #89725-10691 ???) also has issues - it separated at the leading front edge and the first 2" are missing. A previous owner tried to glue back what's left, but I have that leading, loose edge that "sticks it's tongue out at me" whenever the door is closed. At least that looks better than when the door is open - whatever was used to "fix" it looks like that tan, expanding foam insulation.

I also thought about making it "go away" with an Exacto knife, but that would mean removing a few more inches of the rubber. I'll probably verify that it can be replaced (without financial pain) before I cut it off prior to my road trip this weekend. I'll use that trip as a test so I can see if the removed section turns out to be a big deal. If I don't get any extra wind noise or leaks, then I'll consider cutting off the bad part as "issue resolved."