Powering command blocks sometimes doesn't execute commands for no apparent reason.

Partner Rank:

1

Partner Team Reporting:

Jigarbov Productions

Verification builds and Platforms:

ver 1.12.0.2 build 2039725

Summary:

Powering command blocks sometimes doesn't execute commands for no apparent reason.

Impact:

The idea that command blocks will simply not work for no apparent reason is akin to a car that breaks down while driving down the road. It'd ruin a car company if their products did that, and likewise, this would ruin the marketplace.

Repro Steps:

1. Download the content "Infinity Plumber" from the Marketplace
2. Proceed through the tutorial according to the attached video.
3. when the point has been reached, do /xp 100L @p
4. Press the upgrade house button

Observed Results:

The command block chains that trigger an upgrade will trigger. The housing one in particular starts at 1654 79 1236. In the video you can see it does indeed trigger correctly, runs down the repeater strip through a series of command blocks then gets to the ones at 1644 79 1236 where it hits those command blocks. Those command blocks get powered but do not execute the commands inside them.

Looking at the first in the chain, it is a normal impulse command set to "Needs redstone" with a regular everyday clone command. Looking in the command it says no blocks cloned. 2 steps down the chain there is a setblock for a stone button. the chain is connected properly by unconditional chain command blocks that are set to always active. None of them work.

Expected Results:

The impulse command and subsequent commands should work as expected. The clone should clone over the sign showing +1 housing, the setblock for the button should replace the button for the mechanism.

Screenshots/Videos attached: 

Yes: https://www.youtube.com/watch?v=NJ26fhRMw8I&feature=youtu.be

This is a full reproduction video, to view the actual error in action start at 4:56

If you don't like youtube, I sent a copy of the full video to Greg on slack.

Regression Builds:

This did not occur in 1.11 any

Notes: