I can't reproduce it, but in my live playthrough, every now and again it stops detecting the platforms being in the same orbit or whatever.
The items don't get transfered.
When requestor chests are being removed and re-added, it works again.
For save file etc, contact me via answering this please :)

also getting this. mod reliability is pretty low :(
keeps breaking.

ditto - it worked the first couple times, then it stops completely. possibly once you leave orbit the first time and come back, it doesn't register (just a guess)

IPL as alternative, rly good mod. even better than the upcoming 2.1 P to P transfer, since u can select and set thresholds per items you wanna provide/request, not just all/none.