I don't know about any metal poisoning, but given that your new keiki has been recently cut and potted up, it seems to me that it is just undergoing a far amount of stress with the transition. it is possible that in the "move" that these root tips were damaged and it is trying to conserve energy by simply "taking back" the nutrients stored in those tips and focusing on putting other energy into the other roots or just surviving the growing condition change. My thought would be to just cut the tips just where it meets the healthy tissue and give a dab of cinnamon to help the wound dry and help prevent secondary infection.
If it is only these three roots that are showing signs of distress, I wouldn't worry too much. I would continue to monitor the situation to see if it changes any, but if the majority of the roots are okay and these exposed roots aren't dying back fast, a little cutting to remove dead tissue and cinnamon should do the trick for now.
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