[MC-3905] Piston powered by block being pushed vertically

I did some testing and it appears that in 1.4.5. the block that a piston pushes upwards also powers the piston, so this locks it in place permanently.

What I expected to happen was...:
The piston would retract.

What actually happened was...:
It did not.

Steps to Reproduce:
1. Place a piston facing upwards (either kind)
2. place a block on the piston
3. power the piston a constant source (torch, lever)
4. place a lever on the block extended by the piston and turn it on.
5. Turn off the source directly powering the piston.

Linked issues

duplicates 2

MC-108 Droppers, Dispensers and Pistons activate when blocks are providing power diagonally or two blocks above Resolved

MC-14051 JVM crashes in ig4dev32.dll / ig4dev64.dll (Broken Intel graphics driver for the "Mobile Intel 965 Express" graphics card) Resolved

Attachments

Comments 11

CubeTheThird 2012-11-27T20:41:57Z

Can confirm, though I am unsure if this is intended. This behaviour is not like a BUD.

Anon Ymus 2012-11-27T20:47:36Z

When the block the piston is pushing is not touching the piston (because the piston is retracted), does powering the block cause the piston to extend?

CubeTheThird 2012-11-27T20:52:49Z

In my trials it does not.

Thoryn Haylett 2012-11-27T21:55:05Z

Same here.

Tails 2012-12-12T17:56:17Z

Pretty sure related to quasiconnectivity.

1 more comments

Tails 2012-12-12T21:08:22Z

In my tests activating the leaver doesn't make the piston extend till a block update is given - hence the relation.
Deactivating the leaver on the other hand retracts the piston without a block update for some reason.

Tavis 2012-12-18T20:15:03Z

The piston extension updates the piston base whenever it gets an update.

Tails 2012-12-18T20:22:55Z

So basically this is nothing special, but another type of quasiconnectivity.

Tavis 2012-12-18T20:40:35Z

Correct.

Tails 2012-12-18T20:42:20Z

Ok resolving as duplicate of MC-108, thanks for the info 🙂