I've noticed this since A21 b313, where sometimes placed lights will change settings to be colored or intermitted/blink. They also are not as bright. It seems to temporarily resolve itself with save and reload, or disconnecting from the server and relogging.
It can also be temporarily fixed by picking up the lights and placing them back down and reconnecting to power.

It can also be temporarily fixed by picking up the lights and placing them back down and reconnecting to power.
