What is the fate of the angels entrusted with a human being after their death?

The conditions and affairs of angels are part of the Unseen, known only through revelation (al-sam'a). There is no text regarding the death of the angels who record good and bad deeds when a human dies, nor about their continued existence or their destiny. This matter is entrusted to Allah. This is not something we are obligated to believe in or something that relates to our actions. Inquiring about it is considered meddling in what does not concern one. The questioner is advised to direct their effort towards asking about what is beneficial in matters of religion and this world.