The fund's income yesterday refers to the income of the previous trading day. Generally, yesterday's earnings can only be seen on T+ 1 Fund holding income refers to the total income of the fund since it was held. After the fund is sold, the income of the fund is included in the total income, not included in the holding income.

The fund's income on that day will not be updated until the second trading day, so what we see is the income on the previous trading day.