When using Language Server for a project on an NTFS partition from Linux, the error "LanguageClient [client] Unexpectedly finished." appears in General Messages.
This issue is verified against the Rust Language Server, which runs correctly when the same project was tested in VS Code. When the same project is moved to a EXT4 partition RLS runs without issue in Qt Creator.
Of note, using NTFS partitions from Linux is a common idiom for dual boot systems as a shared partition.