Undefined field/global errors

[TimoXBeR]

Any time I try using a global or a function of a global, autocompletion works, but it returns undefined error.

Here's another example from Basalt files:

I already tried adding settings.json file to workspace with {"Lua.workspace.library": ["C:/Users/user/Documents/lua-libs/CC-Tweaked/library"]} in it, but still didn't work.