Plant in Darkness

I am trying to set a plant that will only able to be placed in darkness lvl 5 or lower I can set the light value for this and it works but seems to only work on update tick so I have to set it to break if the light value is greater then 5.

I am wonting to limit it so it cannot be place period unless the light is at 5 or lower in theary it should work the way I set it.

if get light lvl at greater then to equal to 5

do place mushroom.

not working right clicked on block with item