Why does table B25120 5-year 2021 have missing census tracts

Hello,

I'm accessing Table B25120 for San Diego County census tract geographies using ACS 2021 5-year data. 

It appears that a number of census tracts do not appear in the table although they do have valid housing units according to variable B25002.  For example, census tract 06073005102 does not appear in the B25120 table although there are 2,721 HU reported in B25002.

Here are links to the census tables I'm accessing:

B25002:
B25120:

Can someone help me understand why these tracts are missing? Is there a better table to use for these data?

Thanks,

Kate

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