Entering the ro.wp Recent Changes page with the default settings (robots hidden), I saw a change from from Strainubot (see attached screenshot, the change with bold). It was the first of many changes to that page made by the user, but only one was visible. The change is in the URL field.
I've checked that Strainubot was still in the robot category - it was. I've clicked on "show robot changes" and all changes by Strainubot appeared. I've then clicked on "hide robot changes" and only this change appeared.
The same thing happens in my watchlist, so I suppose there is a problem with the way this change was recorded. I was using pywikibot core and I made no changes to the configuration or scripts before making this change.
