More likely phantom voltage on the disconnected hot run.
If stray (not phantom) voltage on neutral, there would have to be some return path, such as to EGC because of some filtering or other coupling in the LED driver circuit.
Ran several experiments on a Costco 4 ft twin tube LED shop light.
First test was an adjustable sine wave voltage from a Variac. One tube dropped out at about 9 V by Variac dial, and the other about 8 V.
Second test was 124 V to series connection of capacitor box and the LED fixture. Required 0.5 to 0.6 mfd capacitance to maintain one tube on. With 0.1 mfd less flashing of the on tube occurred. Another 0.1 less and neither tube was lighted. Voltage across the fixture was down around 7 V on a Flike 27.
Stray wiring capacitance in a home or building won't get close to 0.6 mfd.
Electro-Boom has a you-tube video that shows & explains why some of the LEDs will glow dimly when off. Basically the cheaper ones drivers are not designed well ( no discharge resistor after the bridge rectifier) & a few mico-amps will cause them to glow.