Removing imports sounds like a gofmt issue. That is the linter / formatter for all Go code. If you don't run the linter and try to build the code, it won't work anyway. For example, I added the net/http package to a file without using it and got this error when running `go build` without doing `go fmt` first:

    ./example.go:8:9: imported and not used: "net/http"

So VS Code's Go plugin removes the unused import because otherwise the code is invalid. I'm a vim user and `vim-go` has the same behavior.