Setting "Is Player Mappable" for a new Map Key

Hi,

I am setting a new key for an input (UE 5.2), and I want to set the “Is Player Mappable” option on for that key. Below is an image of how I’m doing this. But the new mapped key in the context file is not being updated; “Is Player Mappable” remains false in the context file. Am I doing something wrong here?