Why was the Canterbury tales published after Chaucer's death?

Chaucer’s original plan for The Canterbury Tales was for each character to tell four tales, two on the way to Canterbury and two on the way back. But, instead of 120 tales, the text ends after twenty-four tales, and the party is still on its way to Canterbury. Chaucer either planned to revise the structure to cap the work at twenty-four tales, or else left it incomplete when he died on October 25, 1400. Other writers and printers soon recognized The Canterbury Tales as a masterful and highly original work. Though Chaucer had been influenced by the great French and Italian writers of his age, works like Boccaccio’s Decameron were not accessible to most English readers, so the format of The Canterbury Tales, and the intense realism of its characters, were virtually unknown to readers in the fourteenth century before Chaucer. William Caxton, England’s first printer, published The Canterbury Tales in the 1470s, and it continued to enjoy a rich printing history that never truly faded. By the English Renaissance, poetry critic George Puttenham had identified Chaucer as the father of the English literary canon. Chaucer’s project to create a literature and poetic language for all classes of society succeeded, and today Chaucer still stands as one of the great shapers of literary narrative and character.