There seems to be a new parameter “only snap if window is below that size” (or similar, because mine is in german 
)
I had to increase this slider to enable snapping
XCFC-Menü / Anwendungen / Einstellungen / Einstellungen / Feineinstellungen der Fensterverwaltung / Platzierung / Kleinste Größe zur inteligenten Fensterplatzierung
Slider → weit nach rechts geschoben
(translated by google) 
XCFC menu / Applications / Settings / Settings / Fine tuning of window management / Placement / Smallest size for intelligent window placement
Slider → pushed far to the right
6 Likes