This isn’t an “Ask Fedora” so much as a PSA for folks using the toolbox-vscode scripts to use VSCode Dev Containers via flatpak and toolboxes. Yes, this sounds a bit convoluted, but toolbox + the script makes for an awesome developer experience.
The combination of Fedora 39 + the latest changes to VSCode may require you to do a “full” reinstall of the VSCode flatpak, which includes removing any app config/cache data that may be lying around on your system. Re-creating your dev toolboxes may also be required, especially if you are upgrading from Fedora 38.
Full details can be found here: toolbox-vscode#36