After starting a new map in creative, I found myself next to a biome boundary between a desert and a savanna. After a little while, it began to rain, with some odd effects. The rain seems to only affect the desert, and only near the ocean or river areas. There is a river in the savanna that also has full rainfall, whereas the grassy area has none. The desert also has rainfall near the river. My guess is that the beach biomes are pretty much universal, with no regard as to whether it is in a desert or savanna, or other area. The river technical biome may be causing rainfall within the desert area as well, registering the nearby sand as if it were a beach.
After getting some initial supplies, I changed the mode to survival, so this probably affects both version. The world itself is in the latest snapshot as of 9/24/3013. The overall effect seems of minimal importance, even though it can be immersion breaking. Still, I didn't see this bug reported anywhere, and thought it might be useful to know about.
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World type: Large Biomes
Seed: 6173510678940268000
Coordinates: x:-324, y:64, z:44.
I've been building a lot on this world, but those coordinates should at least get you within the general area. It's near a desert, savanna, small river, and what appears to be an ocean.
I'm attaching a screenshot, taken nearby at x:-267, y:71, z:38.
Sorry, I thought I had mentioned the Large Biomes map type in the main description, I must have missed putting that in.
Confirmed, but looks strongly Working as Intended, since there is no "Desert beach" or "Desert river".
Experienced it in one of my worlds, it only rained near a desert shore. Maybe its working as intended but looks really unrealistic and out of place.
Edit: It was 13w41b.
The developers can add "Dry River" biome (on the analogy of "Ice river") with no rainfall. Dry river will be generated on/beetwen dry biomes. However, if the river chunk borders at least one rainy biome, this chunk will have usual river biome.
Regardless of the way of solution, I hope this problem will be solved soon.
Can you please provide the seed of the world and the coordinates of that place ?