Представляю, как они в аврале будут допиливать кучу игр по обратке в ближайшие месяцы

PS5's "unexpected errors" with PS4 games warning reminds me of PS3's early back-compat.

One title, 24: The Game, was listed as compatible and worked fine on PS3... except Jack Bauer was totally invisible, apart from his gun and his hair.