Hi HP
Explanation: I had a separate edit template for Stroll, so that every time you edit a tiddler and close it, missing tiddlers are created. This was to imitate Roam Research functionality and save a step of manually creating every tiddler. I think to avoid users' confusion and work for me every time TiddlyWiki gets upgraded, I will remove that functionality.
I will update the Stroll tutorial to remove references to that functionality, and I will update Stroll and Stroll's empty.html to 5.1.23 and without the offending tiddlers in a few moments. But for you, all you need to do at the moment is delete that config tiddler, and it will return to its default state, which points to $:/core/ui/EditTemplate instead of my custom edittemplate.
There is still a problem with the Close others and Fold others not working in the more menu. I suspect those are problems with the Stories plugin by Saq. I will poke around to see if I can find the problem, but most likely Saq will know how to fix that. Everything else seems to be working okay.