While normal daylight sensors turn off completely at night, inverted daylight sensors still work during the day. They give off a very small redstone signal despite it being day. This completely breaks their purpose. Note that I did wait sometime during the day for just in case it was too early, yet the inverted daylight sensor stayed on.

Steps to Reproduce:
1. Put a inverted daylight sensor next to a piece of redstone dust or on a redstone lamp.
2. Set it to day.