Timing of the defect matters

Khiyar al-Ayb: Defects, Remedies and Waiver

The chapter concerns a defect attributable to the earlier seller-side stage, not every problem appearing after purchase.

If a buyer received functioning goods and damaged them through later use, that newly caused damage is not itself the seller’s pre-existing defect.

Compare a concealed broken component already present when supplied with a component broken because the buyer dropped the machine.