Original Summary: Jarring shift from morning to night a minute after waking up. World created in 23w45a, Game Mode: Hardcore
This bug was an issue with the weather and not the day/night cycle, as I originally thought when I first wrote this. I edited the report accordingly. Strikethrough words are from the original bug report and italicized words were added later on.
This incident took place in a Hardcore world I created in the 23w45a snapshot. In the "Experiments" tab, bundles are off, villager trade rebalance is off, but experimental 1.21 features are on. I was around a savanna village to collect acacia wood when this happened.
The sequence of events that took place:
Slept inside one of the small savanna village houses visible in the screenshot
Exited villager house
Sprinted (with some jumps and slowdowns) in a direct line from the village to the place I'm standing in the screenshot
Game instantly shifted from
morning to nightclear to thunder weather types as I approached where I'm standingHostile mobs instantly spawned in around me (field was empty before shift
to nighttook place)Pillared up from the spot I was standing
Took attached screenshot
BUG: The weather in this savanna biome changed from clear weather to the thunder weather type in less than a second. Hostile mob spawning also didn't function as is intended, with all of the mobs appearing far quicker than normal when conditions change (i.e. day to night, or clear to thunder). There was no fade or transition going from clear weather to thunder. I didn't get a screenshot of the sky before the abrupt change happened, but it was bright and light blue with some clouds.
I went from casually sprinting to a forest at morning time in clear weather with no hostile mobs visible in the area, to the time the weather jarringly shifting to night a thunderstorm with hostile mobs appearing all around me. None of the hostile mobs near me in the screenshot have noticed I'm there but it's a strange bug I've never seen before.
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If it is a thunderstorm, this is still a strange (buggy) occurrence as there was no transition at all into the rainy weather like there's supposed to be in the game. The hostile mobs also spawned in extremely quickly, faster than they're supposed to when conditions change. Once I'm playing in this save again I'll update the bug report if I get better details. The weather was completely clear and bright seconds before the shift happened.
When a thunderstorm happens in a savage biome, the sky changes but no rain happens. The sky changing should be sort of jarring, because that's how it is normaly, except when in a different biome that allows rain, the rain covers up the jarring change.
Thank you for describing how everything went down when you experienced the issue. 🙂
Right now though, there is unnecessary information which may convolute reproducing this consistently and clearly. If you can still reproduce this in the latest version (24w03b), could you please find out how this issue occured, and remove any unrelated steps or information which does not have an affect, or play a part in the bug? Having clear, minimal (yet still descriptive), and consistent steps to reproduce would be very helpful. A world download would also be appreciated, along with any specific coordinates to important locations, and *exact *times of when the issue occurs in-game.
It looks like a thunderstorm began. Although no rain is visible in savanna biomes, stormy weather still darkens the sky and allows hostile mobs to spawn.