I am using Lightroom Classic CC and have the latest updates but I am having a problem with disappearing edit pins, whether I choose to show "Always" or "Auto."
A few symptoms:
1) when I go back to an image, say with the Brush, only the New option is available and the pins from the previous edit do NOT show. The Edit options is greyed out.
2) If I try to bypass the problem by simply trying an additional adjustment in the previously edited area, I get a grossly compounded result without any control over it.
I found one emergency (and unsatisfactory) work-around: I try to make the supplemental adjustment using a different tool than before (e.g. radial filter instead of the brush). However, this does not work once all the tools have been used in the same image. The only remaining option is to move the image to another application (e.g. Photoshop, Topaz) and bring it back to Lightroom.
This is either a foftware flaw or there is an important setting that I have failed to identify :-((