Census Block Groups for Median Income

I am trying to use data from the 2020: 5-year estimates on `MEDIAN INCOME IN THE PAST 12 MONTHS (IN 2020 INFLATION-ADJUSTED DOLLARS)` at the Census Block Group level for Washington State, but the data doesn't seem to be that granular. I have seen This post talking about high MoE, but I find it hard to believe that there isn't any data for the whole state. I am able to find information for Census Tracts, but does anyone have an explanation for no data for CBG's?

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