Every PL keeper is now having to deal with this sort of "pass out of the back" moments. Its the way the game has changed. Raya has had plenty of moments at Arsenal, Ederson and Allison too have had their moments.
I am not too worried about Sanchez error yet. He's had a few shaky moments but also few good games (Bournemouth, Fulham)
Also think, mids (Gallagher?) should not have been on their heels and should have been ready for a pass that came through the lines.