Apparently Evans spoiled Anthony Mackie's promotion through some very MCU theatrics, part of which had convinced Mackie that a new version of Endgame's script he hadn't read was going to kill off Sam Wilson. As you'll read in this anecdote recalled below, that couldn't have been further from the truth:

No one was more surprised than Anthony Mackie that he was the new Captain America – mainly because he thought his character Sam Wilson was going to die in Avengers: Endgame.

Chris Evans recently dropped a bombshell during a casual conversation, accidentally spilling the beans on Anthony Mackie’s new role as Captain America in upcoming hit.on January 17, during

Anthony Mackie initially thought he was getting killed off in Avengers: Endgame due to racial bias, until Chris Evans surprised him with the truth.

Anthony Mackie didn't know what to expect when Chris Evans led him into his man cave a few years ago. Mackie, the current titular hero in the upcoming Captain America: Brave New World, revealed in a conversation with Fandango how he found out he'd be taking the shield from original star Chris Evans.