Bother spawners are completely dark. Both have also stopped spawning mobs at least once and both required the server to be restarted.
Is this on a server? I have had something like this happen when my client thought I placed water but the server disagreed.
This still seems to be happening in 1.14.2. Maybe it has something to do with path blocks since they are not a full block.
Can't upload the world since it's over 200 MB but i've posted a few screenshots, the area near the door is light level 7. The world was a server when the problem occurred, not sure if it could be a server side issue.