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@ffm
The pressure of the quill stem expander bolt can apparently split steerers on the thinnest point If you didn't have the stem very far in.
As for solutions, if you ditch the centre-pull caliper for a side pull you could remove the steerer-mounted cable hanger, lowering the stack height be a few mm. You could then chop the damaged part of the steerer off and have nice intact threads to screw the lockring onto.