You can somewhat mitigate this, at the same moment you ask for the new edit, by adding new info or specifying the lost meaning you want to add back. But other things will still get washed out.
Nuances will drift, sharp corners will be ablated. You're doing a Xerox copy of your latest Xerox copy, so even if you add your comments with a sharpie, anything that was there right before will be slightly blurrier in the next version.
Often that thinking bit itself provides value to the person doing it, beyond the text itself. By letting a LLM do it for you, you rob yourself of the change of thought and the new findings you may encounter.
Working with LLMs just makes it quicker to get going, bit you need to be a ruthless editor.
Occasionally it would report the action, sometimes it would not bother to report it. It never reached into the README on an unrelated doc edit, but if it was touching the README, that line was getting excised.