Lurking for a long time but am now stimulated to jump in. My Supercharger2 (2020) has had issues with the rubber flapper cover. It is POS.
But the worst is when it completely comes off. Trying to get the back attachment tab reset in the charger cover plate is a major time suck. Been there, did that and I found that if you lube the rear insert with 303 Rubber UV protector you can use a small plastic rod to push it back into place. Then when you need to flip it back to plug in the charger hold your finger on the middle of the flap (right hand) whilst flipping the left side of the flap back to insert the charger plug. When done, do the same, hold the middle to rear of the cover, then snap it back in when flush using a finger in the center of the cover. It snaps right back in. Just waiting for the day a viable replacement comes out...hah.