Changing gender isn’t a dealbreaker for me on it’s own, but non-consentual body transformation of this nature frequently goes into themes that make me very uncomfortable.
For example, having a character being forced into a gender they’re not comfortable with either through a curse or magical accident, and then made to live with and eventually permanently accept their new identity skews way too close to saying “Conversion therapy works and is good actually” for me to find enjoyable, even if that’s not the author’s intention.
One kind of Gender change story I’d like to see more of is when a character actively tries to magically change their body because they specifically want to see what they would look like as a man or a woman.
