I have a command block contraption that uses impulse command blocks, that /entitydata and /execute at ore, and turn them into ingots. it's one of those "one command creations"
a Command Block Finds the iron ore item, Gives it a Score of "cutclean = 1 Then another commandblock Turns The ore into An ingot,and another makes it drop a bit of XP, then another Removes The Scoreboard Score.
AND In 16w06 it worked fine. but in 16w07 AND The Pre-1.9, The scoreboard gets stuck and does not remove the scoreboard Score right away after it adds it to an item.
i checked, and there was an item with a score of "cutclean" that was set to 1, and a command block set to remove any scores from items that have a "cutclean" score of 1. BUT it just Sits there, and does nothing! it does not remove the score when a command block is Clearly set to remove it. and it worked in 16w06.
sometimes it Does remove it, but it takes WAY more then 1 tick like it should be. sometimes it takes a few seconds, or 10-20 ticks.
Steps to Reproduce:
#1 Set up my Cutclean in 1 command device. (make sure you are in 1.9-PRE-1 or 1.9-PRE-2) Here's the link to The Command: http://pastebin.com/Raekj6N9
Copy and paste the command into a regular command block and activate it, and it will set up the machine.
#2 do /score objectives setdisplay sidebar cutclean
#3 Toss a gold ore ITEM on the ground. because of the bug, most of the time it creates a string of XP. it's supposed to only give you one orb, but it's broken so it never stops.
#4 if you go to the command block in the photo, you can clearly see that it is set to remove the score of any item with a score of "cutclean" that is = to 1. but it gets stuck most of the time, and does not remove the score for whatever reason. this will break so many maps if it is not fixed.
to give you a better Idea, try the command in 16w06. you will see that dropping gold ore turns it into a gold ingot, drops 1 XP orb, and then stops. Like it should.
even if i change to command to a more simple one: "/scoreboard players reset @e[score_cutclean_min=1,score_cutclean=1] cutclean" It STILL Fails.
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It is not lagging. i'm looking in the launcher as minecraft is running, it is NOT skipping any ticks. everything in minecraft works perfectly fine, except for that scoreboard error. fact is that command blocks are not working the same as they were 2-3 weeks ago during 16w06. and that will break quite a few thing. many poeple have been working on maps during the snapshot stage so they can release them in 1.9. but if this keeps up there will be lots of version switching just to make a custom map work for whoever is playing it.
Make sure the (internal) server isn't lagging behind, else it's just tick lag which has other causes