I believe the resonance from transfiguration is shown to be very minor, for whatever reason.
When Harry has to transfigure Voldemort himself, not just contact him with transfigured material, it is only mildly uncomfortable.
It is not incomprehensible that a much, much lesser contact could escape any notice at all until at very close range.
This is a new thread to discuss Eliezer Yudkowsky’s Harry Potter and the Methods of Rationality and anything related to it. This thread is intended for discussing chapter 114, and also, as a special case due to the exceptionally close posting times, chapter 115.
There is a site dedicated to the story at hpmor.com, which is now the place to go to find the authors notes and all sorts of other goodies. AdeleneDawner has kept an archive of Author’s Notes. (This goes up to the notes for chapter 76, and is now not updating. The authors notes from chapter 77 onwards are on hpmor.com.)