Oh I was wrong.
https://salesforce.stackexchange.com/questions/367157/custom-indexes-of-null-records#:~:text=By%20default%2C%20the%20index%20tables%20do%20not%20include,rebuild%20them%20to%20get%20the%20empty-value%20rows%20indexed.
It's not good practice to mark fields as External IDs which are actually not External IDs, and Salesforce Support does create indexes with null values
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