A similar thing had been happening for quite a few versions on our end, most recently with version 3.18.2. Updating to the latest Elementor Pro plugin would wipe all the ‘Posts’ widgets in the whole website, containing all the blog posts and other posts. We’ve had to restore the website to the latest backup (luckily we have daily backups).
We noticed it only seemed to happen with the Elementor Pro plugin (not the regular Elementor), which is worse because it’s a paid service. What worked in the end for us was running the Elementor Pro Data Updater and updating the Elementor Pro plugin after.
