The teleporters are plain buggy. Try running your sim again but start with 130 robots. That seems to fix it. There will never be a sim that just has a fixed number of robots, so I don't see a big issue here.
The logic to save a simulation is used for teleporting robots as well, the simulations seems to save fine, therefor I know I have not introduced a broken feature here.
There is a secondary problem here with loading an existing sim file though, but it seems to resolve itself in most cases as well. I recommend however, not to load existing simulations while running teleporters.
I must have edited this post atleast 5 times, sorry for the confusion.
Attached is a working version of the experiment described by Testlund above.