The author recounts their experience buying and attempting to dump the game Martial Masters for MAME. They were surprised to find a Taiwanese version of the game with rare chips, leading them to believe the initial dump was bad, causing the game to crash in MAME. After successfully dumping and booting the game, they discovered that the Taiwanese version was actually identical to the Chinese version once dumped correctly. This revelation led to the removal of the Taiwanese version from MAME. This experience highlights the importance of double-checking data to prevent unnoticed errors in databases, showing that databases are constantly evolving.
https://www.mistys-internet.website/blog/blog/2024/03/01/that-time-i-accidentally-deleted-a-game-from-mame/