We could always kill two birds with one stone by changing our illustration of Force healing. It could explain Rey’s crackly saber a bit. Either it could just show a shattered Kyber crystal being given Force energy, or it could be an additional illustration next to our current one. Although that runs the risk of being too crowded visually.

I think the first option makes the most sense. It would mean that Rey is trying to use this power in an unconventional non-Jedi way with the serpent. But perhaps the Jedi were wrong to not want to use this power on sentient beings? Idk, this is all stuff I covered in my novelization so I’m a bit biased.