Anyone else had their body type switched, seemingly for no reason?
I tend to do playthroughs where I aim for the female (feminine?) body type while still retaining the dick, but over time, seemingly at random, it switches back ands gets stuck on the masculine body type overnight, regardless of which gender identity I set it to
It's really frustrating, so does anyone know whether there's a workaround or whether it was fixed in an update at some point?
There's no such thing as "no reason" with the transformation system.
Gender identity is only one part of what influences the transformation system.
Since you went from trans back to male body, I'd say you probably gave your MC a large/the largest penis size. Whilst that's great for natural dominance gain, it works against female/feminine transformations. Clothing as well also factors in.
The dreams when sleeping also convey information hinting at transformation paths. You should have seen it mentioning your MC feeling masculine.
To avoid Forced Transformation, restart and select that you've played the game before.
One of the Saya dreams will present the option to disable Forced Transformation and allow you to either avoid the transformation dream when it happens, or an option on the sidebar to disable it entirely.
Has the MC-X always been February? Because it seems like it will take an awful lot of grinding day by day to finally get to February and access that ability.
Not always. It's been pushed back a couple of times to allow the story to be told.
It used to unlock during Chapter 3 iirc, but the decision was made to make it exclusively post-story content.