For what it’s worth, very few vegetables need dark and some actually thrive under 24/7 lighting (provided you don’t exceed the plants specific DLI), but yes some are photoperiods and can be affected by the lack of a dark period.
Now to get nerdy, the plants need X amount of a certain wavelength to activate the hormone anyways, this way the moon, lightning and street lighting doesn’t affect it. Evolution and natural selection and all that. So bottom line, if you can’t read by light (full moon can provide enough to read barely sometimes) it’s probably fine