Large update of 1800 rows stalling out and erroring with 'failed to fetch'

From PSQL I'm attempting to update a table with 1800 rows, however, the query never finishes and returns an error

failed to fetch

failed to fetch

from the SQL Editor and looks like a HTTP request cancelled.

The select where clause takes 13 ms. Why would the update take so long?

Large update of 1800 rows stalling out and erroring with 'failed to fetch' - Supabase