Girl = neutral (das Mädchen)
No idea why lol.
Mädchen is a diminutive, and all diminutives are grammatically neutral.
It’s the same in Dutch btw, and my girlfriend who is learning Dutch is frequently abusing this as a cheat code: whenever she doesn’t know the gender of a word, she’ll just use the diminutive and it will automatically be neutral.
The worst is that as iconic as it is, this photo doesn’t even capture a fraction of what happened on Tiananmen Square.
The full story is much bigger and much more gruesome. You can read about it here (WARNING: link has some very graphic and disturbing images): https://archive.ph/2020.07.12-074312/https://imgur.com/a/AIIbbPs