Same issue here; I've only tested the Teleport Pipe so far.
I walked a good distance from a Teleport Pipe, placed on top of a Teleport Tether. I then placed another a fair ways away, it worked. Then moved farther away, it worked. And again...Then, it didn't work. So, I moved the pipe back a little. When approached along my original path, 1 connected path...but, I approach it from the fard side of the original pipenal pipe...bingo, zero connected pipes.
This definitely seems like a chunk loading issue. I will try to test something other than Teleport Pipes.