If I knew the command line for this specific pack, I would sure use it. Tired what you showed, changing US to UK, but to no avail.
To find Apps full names use
Get-AppxPackage -AllUsers | Select Name, PackageFullName
Using asterisks makes it easier.
Get-AppxPackage *LanguageExperiencePack* | Remove-AppxPackage
Then, you can install the correct package but as already explained by fg, to avoid the bug you have to install the previous version.
Hi Sibro,
The problem goes away just removing the pack that introduced the bug, installing the previous version was just to prove that it worked fine before the update, that pack added from the MS Store is just updating the language.
From what I see it is not an absolute requirement, can still run fine just with the basic language package installed without the App that is supposed to keep the language current. (Or just screwing it up like in this case. 🤣 )