No predictions loaded for 2040. This site serves NOAA predictions from its own store, and this period has not been fetched for Shag Rock yet. Nothing is estimated or interpolated in its place. NOAA's own page for the station has the official table: tidesandcurrents.noaa.gov.
tidealmanac.site/us/ak/shag-rock-9454125/2040
Shag Rock, AK tide table 2040 (printable) · Tide Almanac