Hello. This bug is basically the same as the last one like it I reported. The save partially reverts back to the way it was before. This time I have more proof in screenshots. Some commands disappeared or reverted to a previous version of themselves. This is the second time I have encountered this. I thought this was the end though. Strangely, it wasn't though. After pausing my game to update a bug report, and returning, I found that items that I picked up off the ground earlier (repeat command blocks) had all returned to the ground. They essentially duplicated (some in inventory, some on the ground). I have no idea how it could change between 5 mins of pausing (not closing). Also worth noting that when I quit normally for the first time (when I left the commands as I wanted), I used "Save and Quit to Title". I will include the screenshots and after posting this check to see if the world changes again. Also I have this tag from before I left the world the first time – [18:20:38] is this a time stamp of some kind? I'm assuming the hours, minutes, and seconds in military time. If you'd like, I can provide more screenshots showing these time stamps (current ones).
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It happened a third time... Providing another screenshot. Once with two items before picking the new clones up, and one after.
Doing a test now to see if it is a chunk thing.. I put two blazes in two adjacent chunks. If I see two in the same spot, I'll see the duplication.
I've come to a breakthrough... I just quit the game from the chunks pic... joined back in... and the command block items spawned back for a 4th time, and the blazes that were in the same chunk are gone. This means that is TRULY DOES REVERT BACK TO A PREVIOUS POINT. And it only happened in that chunk... sorry I'm excited that I finally understand this soul crushing bug a little bit better. As you can see the blazes in the adjacent chunk are untouched and fine.
I believe this may have also been the issue for the last time it happened... the more I messed around with the commands, the more commands I collected in my inventory, collecting more data. It was different the first time though as my inventory was reset as well... not just the blocks and entities around me... this may be because there was an overflow of data for the player information so it couldn't save past a point.
Also the world (first one) only went back to the way it was way before I saved once. It never was repeatable... while with the second world it is (continues to be repeatable).
As described in MC-102843, the last output text field is so long, the chunk is no longer able to be saved with that string. You aren't getting any lag like described in that report, since their issue causing the last output field to become long was a recursive operation and text field became longer and longer every cycle.
So in other words what you are saying is that the same issue is occurring, but not causing lag because in the other report, the command data was constantly being changed and the data had to be updated constantly (versus not being changed and therefore not being updating from what is was last)? I guess I could compare that to having to paste that long string I commented before (being delayed and almost crashing Chrome), versus pasting it ten times a second. Is that a good way of understanding it?
If so, I suppose it is really a matter of scale in the sense of how much the overflow is and how often it occurs.
The last two pictures are showing the items coming back from before. When I reentered the world to find it messed up (avoiding the word corrupted), they were on the ground. I took screenshots... looking over this again, I believe they were duplicated once upon reentering the world. Really they existed in my inventory and in entity form on the ground. I never made more than one of each command block (They are all different and specific, non-stackable, only stackable to an exact match)