In CorelDraw 2019 Windows (Windows 10 x64) version not working the snap to guidelines funcition with grouped objects.
You have snap to guidelines turned on (this is not on by default) and it still does not work? Can you provide a few more details on what you are seeing?
Snap to guidelines turnded on.
Try to group more obejcts (pictures, text, curves), snapping sometimes works, sometimes not.