The details seem like they would matter here. If he’s transfigured into a rock, as far as we know he would not be conscious and experiencing anything, so how could he ‘will’ to go to another body?
Conversely, you could ask: if he can’t be conscious or experience anything in his current “body”, doesn’t that mean it’s dead for purposes of the Horcrux spell, and he is automatically shunted to another horcrux?
I don’t think we know enough details to be sure what would happen.
The details seem like they would matter here. If he’s transfigured into a rock, as far as we know he would not be conscious and experiencing anything, so how could he ‘will’ to go to another body?
Conversely, you could ask: if he can’t be conscious or experience anything in his current “body”, doesn’t that mean it’s dead for purposes of the Horcrux spell, and he is automatically shunted to another horcrux?
I don’t think we know enough details to be sure what would happen.