Source: MMOWTS
It's been 2 years since ACNH's release, but there are still a lot of active players, and that's because Nintendo updates right after its release every month, whether it's providing new content to the community or fixing existing issues, which is to satisfy the players. And the current 2.0 Update and paid DLC also provide players with freshness, you can directly come to MMOWTS to buy ACNH 2.0 Items.
Although the game has worked well, it still has some hilarious bugs. Recently, MMOWTS found that an ACNH player shared an interesting phenomenon in which a bug in the game turned the waters of the island into bright red.
On Reddit, Thought Player posted a photo showing how the river on the ACNH island was red instead of the normal blue. The player did not explain the phenomenon in the caption of the photo, but said it was "worrying".
Considering there is only one photo in the post, it doesn't show that the phenomenon exists only in river water, or if it also affects the ocean around the island.
Many people have made fun of the issue, even linking it to the Blood Moon phenomenon in Breath of the Wild. There is also speculation that the red water is a plague, and players are advised to watch out for frogs and locusts.
Considering the waters are where fish are caught, if this bug isn't addressed, it could have a range of effects.