Why were the final volumes of In Search of Lost Time not fully revised?

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The final three volumes of Marcel Proust’s In Search of Lost Time—La Prisonnière, Albertine disparue, and Le Temps retrouvé—were not fully revised because the author died in 1922 before he could complete the process.12

At the time of his death from pneumonia, Proust had been struggling to finalize the revisions for these concluding parts. Consequently, they were published posthumously between 1923 and 1927 in an advanced, though unfinished, state.12