Mate just yesterday I've updated the mod with a hot fix that, at least in my factorio environment, resolved the problem.
This bug was caused by a distraction that I made while coding: I modified the distance of the "charging pods" of the roboports but not the values that we could say resemble the "distance of the energy trasmission"...
(Kinda complex to explain here since I'd need to explain you the Roboport Prototypes.)
By the way: is everything working well now with 4.0.1 version or are you having the same problem?