I built a redstone block piston-timer as shown in the first picture, and without any repeaters, when you leave the chunk with it active, the redstone block will disappear, but the timer will keep working.
MC-6262
Redstone block piston-timer render error
Resolved
Duplicate
0
Alex McGrath
(Unassigned)
Unconfirmed
block, redstone
Snapshot 13w01a
Retrieved
I do recall something like this a bit
As much as I like this bug, I admit
Searching is quite fun
And not what you've done
Therefore I declare this a duplicate
(MC-5774)