The sea crystal lamp is no longer a redstone conductor, but the sea crystal lamp is a redstone conductor.

Minecraft official, someone wanted to modify the sea crystal lamp as a redstone conductor, https://report.bugs.mojang.com/servicedesk/customer/portal/6/MCPE-79271, but I think it is not necessary to modify the sea crystal lamp as a redstone conductor, Minecraft official, you must repair the sea crystal lamp to the present sea crystal lamp as a redstone conductor. But before migrated, he didn't know the redstone conductor, you must repair it back.Minecraft Official: Don't listen to migrated