DIY Replace Third Brake Light on Tailgate LR4

[MarcusTriton]

I had the same, on a 2016, the brake light actually cracked, but the plastic part just fell off the bodywork too. It is going to be a real challenge to clean off the old glue, and also to replicate where they have a much thicker application near the corners (external). New part is ordered, not looking forward to this one. But yes, I also had the light fall off. It looks like there was no adhesion from the glue to the plastic part, it is very much attached, the glue, to the bodywork.

"no adhesion from the glue to the plastic part"...
I was just doing this just today on my 2012 LR4 HSE and saw no adhesive on any area of the plastic under side. What gives?