What happened at Dev's Udyapan ceremony that made him think Sai Baba broke his promise?

At the Udyapan ceremony, a devotee named Dev was disappointed because he believed Sai Baba did not attend as promised. Baba had told him, 'I am coming,' but Dev did not see him there. In reality, Baba did attend, but in the guise of a Sanyasi who came with two other companions. As detailed in Chapter 40, Dev served this Sanyasi and his companions a meal but failed to recognize him as Baba. This was because a 'veil of Maya' clouded his perception, leading him to think the Sanyasi was just an uninvited guest. Feeling let down, Dev wrote a letter to Jog expressing his disappointment that Baba had seemingly deceived him and failed to keep his word.