Phal. (Sedirea) japonica. Roots drying

[Mikehound]

So I recently got this Sedirea japonica that I just unpotted and I noticed that a lot of the root tips are dried. I also have the phal. Little one (japonica x parishii) and it was growing new roots nicely and suddenly the tips dried and then the rest of the root went crispy. Is there a trick to keep the roots healthy while they’re growing? I think the hybrid ones dried up when I watered them but I’m not sure since it was getting the same care as always. I have around 40-60% humidity
Would you advise to mount it at this stage? This is how it arrived from transport.