When using the function selector in Minecraft, the inverted daylight detector was selected instead of the regular daylight detector. The block name is not displayed correctly – instead, it simply says:
tile.daylight_detector_inverted.name
This suggests that the text for this block in the game was incorrectly translated or not translated at all. I probably accidentally loaded the inverted daylight detector when I intended to select the regular one.
This issue is being tracked at MCPE-179063.