Note that it is a known bug that tests currently don’t pass. It is not a regression of the new version but I have to adapt my code to Syncthing v1.15.1.
Maybe Syncthing devs know more about the change within Syncthing itself:
[12:13] Were there any changes about querying the completion of paused devs/dirs? I’m asking because my test setup for Syncthing Tray does that and I now apparently get a 404 error where I previously got 200: syncthingtray test 2 fails · Issue #102 · Martchus/PKGBUILDs · GitHub
[12:14] Not sure whether I’ve got any useful data before, though. Maybe I should just ignore the 404 error in case of paused dirs/devs or not do this request in the first place.