AsNoriuanswered grow question a year ago Pistils have no influence on bud development, but its a sign that something wrong.
In my experience ;
A. Big burn , aka overdose ( think yours )
B. Wind burn
C. High temps and humidity
D. Spraying while lights on or any kind of spraying
E. Wrong ph
Never had root issues, so cant tell.
But during root bound you definitely dont effect pistils. Was transplanting even in flower, no difference for plant.