Some people remember that, up through the 2000s, the inside part of the kanji for "sea" (umi) was the character for "mother" (haha), but in reality, after Japan lost the war, in 1946...
There are people who remember that up through the 2000s, the kanji for “umi” (sea) had the character for “mother” as its inner component, but in fact up through 1946, after Japan lost the war, it did use the “mother” component, and from 1949 it changed to the new form, whereas in China, Taiwan, and South Korea it has reportedly stayed with the original form.
This case is part of the Mandela Effect case database based on "The Window of Opportunity: A Guidepost to the Mandela Effect — The Ultra-Secret X-Files" by Aoyama Takuto.