I created fully closed space (with some creepers) and placed lightning rod near it. When lightning striked the rod, creepers became charged, so they were hit through wall and roof.
MC-204248
Lightning strikes in fully closed space
Resolved
Duplicate
0
This appears to be a duplicate of MC-169186, which was later resolved as, "Works As Intended". This "issue" that you are experiencing isn't actually a bug, and works how the developers intended it to. Please see the parent ticket for further details.