If I try to edit a post which I have just created, I get the following error:
That post was edited by another user and your changes can no longer be saved
The “Save Edit” button also renames itself to “Overwrite Edit”.
This has only started happening since I updated on Friday to “2.8.0.beta2” ( 4681c670c0 )
If it helps, I update weekly, so this is a new issue which has appeared between Friday 4th June 2021 and Friday 11th June 2021.
It happens here on meta too (as per my screen shot).
I cannot work out the pattern to it. It does not happen every time, just sometimes
Several of our users have reported this too.