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Find yourself a QR scanner that gives you a preview of what the code is before sending you to the open web.
I like this one, found it on F-droid. “QR Scanner (PFA)” https://github.com/SecUSo/privacy-friendly-qr-scanner
For example, the QR code sirico@feddit.uk posted (it can scan from a saved picture too) shows me this;
Wait, do normie phone, just, instantly open an untrusted website? The camera on LineageOS has a “scan” mode where it shows the data of scanned QR codes before you make an action.