Looks like the installer executable was changed to a 7z SFX, imo this is the cause of the issue with the icon. Also, it takes more time to start the installer UI and it now extract things to %TEMP% instead of running from memory.
After upgrading to 128, I also noticed a bug with workspace icons not being displayed correctly in the sidebar, maybe related to the unicode chars I use as icons:
wrong-workspace-icons.png