I have a rather complicated Neovim configuration that configures myquickfix buffer to display LSP diagnostics. With an empty Julia project and an empty base module:

module Modend

in a filesrc/Mod.jl, and also another file next to it,foo.jl that contains intentional syntax errors, LS.jl retrieves these diagnostics and my quickfix window is populated with them, despite the empty module above not usinginclude or importing its code in any way. Switching my quickfix settings over to only pull in LSP "document" diagnostics fixes this issue for me.

I do not know enough about LSP or LS.jl to know if this should be considered a bug or a feature, but I would expect LS.jl to only know about files that are referenced in code in some way.