Hear you. So what we are seeing fairly clearly in the first image is the selection line around the 1-pixel dot, rather than the dot itself.
Are you using a post-filter set to 2 pixels or more? If so, what happens if you reduce it to 1 pixel?

"If I were a shadow, I know I wouldn't like to be half of what I should be."
Mr Otsuka, the old black tomcat in Kafka on the Shore (Haruki Murakami)