Pdb is not regenerated after rebuild project

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I have a problem when I change code in my project and rebuild the project with visual studio 2019( the Ue4Editor4.26 is closed), the xx.dll and xx.pdb files are not regenerated, this cause I can not debug my project with new code

if I manually delete the xx.dll and xx.pdb, open Ue4Editor, will rebuild and generate the dll and pdb files,but this process Waste a lot of time

Has anyone had similar issues?