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Hi.
After the 3.0.0 update, I see this message at the top of the wordpress editor:
The backup of this post in your browser is different from the version below.
It is shown in all the posts, and in the two versions of wordpress where I have installed this plugin.
Although I close it, it always reappears.
I open it in a browser incognito window to avoid problems with the browser cache, and the problem persists.
I disable or reinstall the previous version of plugin and the error disappears, so it is an error of this version.
For help, I use the classic editor in WordPress 5.2.1