Several power sources don't have the "Redstone power source" tooltip.

Several items that can provide redstone power don’t have the “Redstone power source” tooltip, including:

• Levers

• Tripwire hooks

• Buttons (all types)

• Pressure plates (all types)

• Detector rails

• Blocks of Redstone (has incorrect “Redstone conductor” tooltip instead, see MCPE-242566)

• Targets

• Trapped chests