Will money burn in a fireproof safe?

Inquiring minds want to know: considering the latest advancements in fireproof safe technology, could we hypothetically assume that cash or paper-based currencies, should they be placed inside a certified and properly rated fireproof safe, would indeed remain unharmed even in the event of a fire of significant magnitude? Would the protective layers and heat-resistant materials within these safes truly safeguard our hard-earned money from the devastating effects of flames, or is there a chance that, despite the best efforts of modern engineering, our financial assets could still be reduced to ashes in the heat of a blaze?