My Minecraft world (1.21, modded minimally) increased in age by almost 1200 days following several game crashes.

This is one of the strangest bugs I have ever seen or heard of in Minecraft. It is mysterious and concerning. I am, honestly, somewhat rattled by it. I doubt you will be able to make sense of it either, but if you do, please email my account and explain what might have happened. I genuinely want to understand how this could have happened.

Steps to reproduce the issue: Unclear. Unfortunately, the only clue I have is the error code “-1073740791” (which was provided after several crashes).

Expected result: I open my Minecraft world, still at day 606 (I believe) without issue.

Actual result: I opened Minecraft, but when I opened my world, it attempted to load and then crashed. It only showed one frame of the world. I attempted solving this multiple times. I rebooted my computer, updated my graphics drivers, and cleaned my RAM (in that order). The error did not go away. I deactivated my shaders and attempted to open a different world. This worked. I then moved back to my main world. This worked as well, after which I reactivated my shaders. The shaderpack in question is Complementary Unbound with Euphoria Patches installed… although those are all third-party and, thus, make no difference.

I reopened my world and found several differences: my mob farm showed loot from multiple witches and massive amounts of drops from more standard mobs as well. A slow-growing bamboo farm of mine, automated with the crafter block, had filled an entire barrel with blocks of bamboo. This would have taken forever. My day counter in the f3 debug screen showed 1800, and when I went outside, numerous endermen were present along with MASSIVE terrain disturbances created by their hundreds of hours' worth of work. More notably, I found one holding a red tulip. I wasn’t aware that they could carry those blocks.

When I opened the game, it was exactly sunrise. The day had just begun.

This is the most important section-- what seems to be a potential underlying issue.

I don’t know very much about Minecraft’s code, so don’t quote me on this. Not only did the game crash within a few seconds each time, but my computer isn’t even that good. It’s a basic gaming laptop from several years ago (an Acer Nitro AN515-57). Despite that, it managed to fully calculate every single in-game event that happened over almost four hundred hours. There isn’t a way to explain this. It feels like an anomaly, really. There is simply no way I can explain or even begin to figure out WHAT happened. My computer would take a long time to calculate everything that could happen, and yet this occurred in mere seconds.

This concludes that section.

The “Affects versions” box only allowed me to input 1.21.7. This is a 1.21.0 error. I played my Minecraft world for just over 600 days when this happened. Most mods I am playing on are meant to improve efficiency, and the only ones that I believe could have resulted in this would be Sodium and a lesser-known mod that drastically increases a world’s build height.

I, personally, find this anomalous and puzzling. Below, I will attach evidence of this strange error.

Images include screenshots of chests from my monster farm, with with loot visible, along with a portion of my base showing clear signs of intense enderman damage. At another part of this tunnel, a hole was punched in the wall by endermen (this was a mostly undeveloped part of my base dug into a hillside instead of deep underground like the rest). The villager shown in the second image is one of four survivors of the mobs that wandered in. I had dozens of villagers before. Regaining some of them, like a Mending librarian, will take hours.