Jan 11 2020
Here is a current example of a invalid edit conflict. https://en.wikipedia.org/w/index.php?title=California_State_Route_1_(Big_Sur)&diff=935204978&oldid=935202709
Jan 10 2020
No I am not double clicking on Save.
Jan 9 2020
I am constantly experiencing this issue. I disabled all browser extensions in the latest version of Chrome (version 79.0.3945.88) except for Extension Manager. I closed ALL tabs but one. I edited my own sandbox page. And I got a false positive edit conflict. It doesn't seem to matter if I select Preview beforehand or not. It doesn't seem to matter how long I wait: 1 second or 1 minute, I usually get the false positive. I tried saving with and without a Edit Summary. This does not seem to affect the false positive issue.