Older Lightning Terminal versions could mark a canceled Bitcoin payment as settled after the funds returned to the sender. A merchant trusting that invoice status could release goods or credit without being paid. Lightning Labs says the relevant fixes shipped in 2025, but it has not provided a tally of actual losses. https://cryptoslate.com/lightning-labs-discloses-critical-bug-marking-canceled-invoices-paid-risking-free-product-delivery/