Based on gaps in the catalog the evidence is that 21 catalog numbers were reserved for the Starshield launch on May 22. That probably means 21 satellites, or maybe 20 satellites and a piece of adapter hardware if the design isn't entirely like V2Mini.
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Jonathan McDowell
planet4589
Starlink precipitation report: 5 Starlink reentries today (S-1584, S-2167, S-2341, S-3353 and S-5378); two over Canada, two over the Southern Ocean, and one at an unknown location