I know that the answer to the question "What is the problem of not announcing the name of the cardinal?" is in "If conditions change, so that the pope judges it safe to make the appointment public, he may do so at any time. The cardinal in question then ranks in precedence with those raised to the cardinalate at the time of his in pectore appointment. If a pope dies before revealing the identity of an in pectore cardinal, the cardinalate expires.". Can you tell me what it is?
The answer to this question is:
the cardinalate expires