Higher error correction makes scanning undamaged QR codes less reliable
QR error correction helps and hinders scanning
https://huonw.github.io/blog/2021/09/qr-error-correction/
A QR code can use one of four error correction levels. Higher error correction forces denser codes, but allows scanning in more situations. A trade-off!
There is a discussion on Hacker News, but feel free to comment here as well.