Why does webpack error: Unexpected character @ occur?

Question

Less

There is a project that is built on different computers, but on some it gives an error when processing the less file.
The error looks like: Module parse failed: Unexpected character '@'. The error pops up only in less, in scss there is no such thing. The error happens when you @ import another less file into this one.
Config:
}, {
test: /\.less$/i,
use: ['style-loader', 'css-loader', 'less-loader'],
exclude: [/mobile/]
},
I tried changing the node version to 10, 14, deleting the entire global node_modules, clearing caches, various less configs, the Ubuntu version matches those where the project is running, there is also the same problem on a Windows computer (also a single one). Hands down already, maybe someone has come across and will tell you what else you can try.