The iPhone SE's haptic touch feature doesn't work with notifications and apparently it's not a bug.
Apple's new low cost smartphone replaces 3D Touch with Haptic Touch; however, despite working similar to the iPhone 11/Pro/Max in certain circumstances, the new Haptic Touch feature doesn't work on notifications. This means you can't press and hold to expand and and interact with a notification.
TechCrunch's Matthew Panzarino confirmed the change on Twitter:
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