That’s one for @eastgate. I suspect that although we get the solution we want, it isn’t a bug as such. Finder if doing the unseen part here. It is given a tinderbox:// ‘URL’ and calls Tinderbox. By the time the app opens, Finder has moved on. It’s like someone knocking on your front door and it wakes you up; you rush down to the door and open it only to find no one there, and no note saying what they wanted. I’m not sure how that is solved but hopefully it can be.
I don’t think the trailing list delimiter should be problematic—at least not for Tinderbox. Why a delimiter? See here for more on the URL schema. A selection with multiple notes is allowed.
If the document isn’t already open, Tinderbox 8 looks for it in the Recent Files list. If it’s not there, it’s going to be stuck. We’re working on removing this limit in Tinderbox 9.