What specific project was Das Ganu working on, and what was Sai Baba's unusual instruction to him regarding a problem he faced, as detailed in Chapter 20?

As detailed in Chapter 20, Das Ganu had undertaken the project of creating the 'Ishavasya-Bhavartha-Bodhini,' a commentary explaining the meaning of the Ishavasya Upanishad in simple Prakrit language. He encountered a significant problem: he could not grasp the deep, internal secret of the Upanishad, which left his work feeling incomplete. When he brought this doubt to the Satguru in Shirdi, Sai Baba gave him a very unusual instruction. Instead of explaining it himself, Baba told him, 'The resolution of this doubt of yours will be done by the maidservant at Kaka’s house when you return there,' highlighting Baba's unconventional teaching methods.