As she looked into things, Alex discovered something. Remember how when the device was used, 2% of people remembered the change? Well, as you might guess, transforming into the opposite sex was a pretty shocking thing to experience and remember. And these people soon started to find one another- most people would tell them they were crazy, but when a group of people across the world whose number were larger than the populations of the UK and Ireland combined were arguing a point, you can bet they made a splash very fast.
Alex found news reports about it with titles like 'The Changelings: who are they and what do they believe?", which did a nice job of explaining things. She watched a report showing a protest in Washington DC where people were marching on the White House, and interviewing 'changelings' who explained their memories of the change and what it felt like. It showed some of the footage of evidence for the change that people had captured by accident too- clips of men's penises tugging into them and breasts forming on their chests, and women's vaginas sealing up and having balls move inside them before their clits started to expand. Most people, including the reporters, said they were probably just deepfakes or something, but obviously Alex knew they were real.
She also found out there was a considerable divide between 'changelings'- some of them called themselves 'true selves', and others 'new selves'. The 'true selves' side experienced serious dysphoria because they remembered being their old sex and didn't want to be the sex they had become. They were pushing for governments to try and reverse the change, or at least provide healthcare support for them to transition back to their original gender. (Ironically, quite a few of them had been very anti-trans before!)
By contrast, the 'new selves' side were really contented with their new sex, but wanted governments to make allowances for them to readjust like educating them and others about their new sex, acknowledge the change had happened, and give 'changelings' protections as a queer group (though plenty of LGBTQ people were opposed to that).
Alex was a little surprised there were so many people who felt like that about the change. It was far more than she'd expected, and she felt a little bad. She wondered what to do about it...