ItemsAdder the custom block does not emit light

i have already add the light level in specific properties but yet it does not emit any light in game.
this is my setting

light_glass:

display_name: light_glass

resource:

material: PAPER

generate: false

model_path: 'base/light_glass'

specific_properties:

block:

placed_model:

type: REAL_TRANSPARENT

break_particles: ITEM

light_level: 10

sound:

place:

name: block.glass.place

break:

name: block.glass.break

i am confused on that…..

RD_Axice do you have LightAPI installed?

solve it thx