Just noticed this fault on the main camera of my Z Fold 4, only happens on 1x zoom. It looks like a spec of dust on the lens but not sure, it's definitely a hardware fault as restarting doesn't resolve the issue. Just wondering if anyone else has this problem. I'll be asking Samsung to repair. Seems others had a similar problem with the S22 on the same lens and as the Z Fold 4 uses the same lens seems like Samsung hasn't fixed the issue when releasing the Fold 4. Very disappointing given how expensive this phone is!