Still having this issue in UE 5.4. I have all the file sizes in the ICO, I have it setup in project settings, I even added it to the Additional Non-Asset Directories To Package under Project > Packaging. It sets the project exe in the ProjectName/ProjectName/Binaries/Win64 folder to the correct game icon, but not the project exe in the outermost project folder. That one is the default epic games launcher icon. And then the task bar icon is completely broken.
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