Yes they are usually
The newly grown nerves are trying to make ‘connections’ w/existing nerves.
It is vey hard to find much of any research about this all tho. Most work seems to be on all the whys, ins and outs of the nerves dying.
‘Zapping’ is the perfect word for it all! So it’s best to think of it as an incomplete complicated electrical circuit. I have found that when I have those [rather than the being under high tension line ‘thrums’] they usually last no more than about five minutes each. That is quite enough at the time tho.
Keep up doing things that seem to be working! As long as you can feel anything? It’s a good thing.