Solid blocks powered by redstone do not update their powered/unpowered status.
If I place a redstone lamp next to a block and then power the block by repeater or redstone torch then the lamp will not turn on until it receives a block update. The same problem occurs in reverse, if the block is unpowered then the lamp remains on.
Thank you for your report!
However, this issue should be closed as Duplicate.
This issue has already been reported so for more information see MC-108897 for continuing updates