Why would the aircraft drop if the tailwind dropped to zero?
My simple non- Airbus twopence worth: Down to 50' (in this case) higher than normal Groundspeed due to the tailwind, so you have a higher than normal ROD to hold the glideslope, so the power's is back below normal headwind figures . Then at 50' you run into what is an effectively increasing headwind, Ground speed drops, ROD is still high, power's back ...if you or the AT don't increase the power you may start dropping short, if you pull the power off....
Standing by to be corrected.