A Marvel Studios prop master explains why Captain America's shield design changed at the end of Avengers: Endgame. Ever since assuming the role of the Star-Spangled Avenger 

That's until he gave it up at the end of Endgame, opting to pass it on to Sam Wilson (Anthony Mackie) instead.  

As beloved as Avengers: Endgame was, there have been several questions that it failed to answer. A lot of them revolved around Captain Rogers' ending, including his decision to hand off the shield to Sam. 

It was never shown to be fixed, so there's understandably some confusion as to where he got the different-looking shield that he gave to his successor. 

Speaking with Phase Zero, Marvel Studios prop master Russell Bobbitt explains what brought on the change.

Considering the fact that Marvel Studios didn't veto Bobbitt's decision to introduce a new Captain America shield design in Avengers: Endgame 

There's no word if Marvel Studios will actually provide any official explanation about this. Despite Bobbitt's comments, it's still possible that Kevin Feige  

Winter Soldier, and the MCU moving on from Avengers: Endgame, it might be a while before fans learn the real origins of this new shield.