Minecraft 1.8.6, Minecraft 15w44b, Minecraft 1.11.2, Minecraft 17w17b, Minecraft 1.12 Pre-Release 3, Minecraft 1.12 Pre-Release 5, Minecraft 1.12, Minecraft 1.12.1, Minecraft 1.12.2 Pre-Release 1, Minecraft 1.12.2 Pre-Release 2, Minecraft 1.12.2, Minecraft 17w43b
When for example a command block as FallingSand falls next to a block providing a redstone signal, it won't update.
When you place a block next to it, it will say "Test".
Note: It appears that this only affects block entities. Here are some examples:
- Command block
- Rails (Activator and golden)
- Redstone lamp