Most players from outside the EPL will have difficulty adapting to the game in the EPL which relies on speed and physical strength, some top players have failed to shine in the EPL due to having difficulty adapting to the style of play there. Radamel Falcao, Juan Cuadrado and De Maria are some of the players who failed to shine in the EPL. Manchester United in Ten Hag hands was not very successful even though they managed to win the FA Cup trophy, but management still has hope for him to continue the project for next season. I think this is the last chance given by the Club management, Ten Hag must repay the trust placed in him with achievements if he wants his position to remain safe.
Talking about players outside the English Premier League who can perform well but fail in this league, it cannot be denied, apart from the names you have mentioned. Currently, some players have not been able to perform brilliantly even though they were bought at a fairly high price and that is because of their appearance so brilliant at their previous club that their current club believed they could perform well and contribute as expected but apparently failed, there is Mudryk at Chelsea and also Darwin Nunez at Liverpool.
Mudryk was bought by Chelsea at a high price from Shakhtar Donetsk, apart from the fact that this club was also going through bad times, which made Mudryk look even worse, but also when playing Mudryk doesn't appear worth the price to bring him to this club.
Nunez may still be better but he was still not Klopp's first choice in the previous two seasons. Liverpool were just luckier than Chelsea because Nunez had progressed in his second season.
It seems like the clubs in the English league value the players they are targeting outside this league too highly, that's why when they don't perform well it will make the player look bad because the price will described the expectations for the player.