Sometimes leaves are generated in the jungle temple, which the Redstone circuit is damaged.

Please provide seed and coordinates.

Done.

Unable to reproduce. In which version did you generate the world?

1.5.1

I talk about the Redstone-circuit of the dispenser

Well as you can see I just generated the world and my circuit is intact.

Hmmm. Do not know why. But the chest in the background is wrong. : D

cannot reproduce

You can close.