The Inverted Daylight sensor works on Daylight... I made this list to describe how it happens.

Steps to reproduce:

• Put a Daylight Sensor up/any side of anything that can be activated (i.e. Redstone Lamp)
• Tap it to turn into a Inverted Daylight Sensor
• Wait for the Night; You'll see it is activated
• Now wait for the day; Now if you look at the lamp, it's still working, even if it's daylight!

What should happen:
Inverted Daylight Sensor should only work on DARKNESS or NIGHT TIME.

What actually happens:
It works on DAYLIGHT, LIGHT, DARKNESS, NIGHT TIME.