PMK
Active member
I didn't see anything like that on my 2019. The "nut" part of the post does indeed have a flat spot that would allow for this, but no there isn't a corresponding seat or anything on the panel for it to key into. The whole post spins freely.
The body panels from 2019 and earlier are the same except color.
Chances are, someone turned the torx fastener and broke the alignment tab off the soft plastic panel.
The white residue you saw, possibly someone tried to super glue it in position.