That's unfortunate. I loved the back car on Viper but this modification is a necessary evil, most likely due to excessive forces being placed on the trains and/or track structure. Happy to hear it has reopened, however.
Hopefully the riders didn't have to endure the exhaust of the evac platform motor being blown in their faces as it moves into position. I was close to getting carbon monoxide poisoning while waiting to get evac'd off of Tatsu a couple years ago.