I found a bug. I searched like the bug report.
Maybe,I could not find it.
At first,We switch on.
Then,output units display some change.
Next,leave the world.
And,open the world.
Then,the output units keep state which leave the world.
If we change switch state,we can not change output unit state.
It,sometimes hoppen

Edited version by kaleb418:

○I searched bug reports like this.
○I entered the world.
○Then, the redstone lamp kept its state (lit) when I returned to the world later.
○It only happens sometimes.