What version of Go are you using (go version)?

$ go version
go version go1.12.4 windows/amd64

Does this issue reproduce with the latest release?

yes

What operating system and processor architecture are you using (go env)?

$ go env
set GOARCH=amd64

set GOBIN=

set GOCACHE=C:\Users\hw\AppData\Local\go-build

set GOEXE=.exe

set GOFLAGS=

set GOHOSTARCH=amd64

set GOHOSTOS=windows

set GOOS=windows

set GOPATH=C:\Users\hw\go

set GOPROXY=

set GORACE=

set GOROOT=C:\Go

set GOTMPDIR=

set GOTOOLDIR=C:\Go\pkg\tool\windows_amd64

set GCCGO=gccgo

set CC=gcc

set CXX=g++

set CGO_ENABLED=1

set GOMOD=

set CGO_CFLAGS=-g -O2

set CGO_CPPFLAGS=

set CGO_CXXFLAGS=-g -O2

set CGO_FFLAGS=-g -O2

set CGO_LDFLAGS=-g -O2

set PKG_CONFIG=pkg-config

set GOGCCFLAGS=-m64 -mthreads -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=C:\Users\hw\AppData\Local\Temp\go-build951410218=/tmp/go-build -gno-record-gcc-switches

What did you do?

vscode version 1.33.1
vscode-go version 0.9.2
settings.json

"go.useLanguageServer": true,
"go.alternateTools": {
"go-langserver": "gopls"
},
"go.languageServerExperimentalFeatures": {
"format": true,
"autoComplete": true,
"diagnostics": true,
"goToDefinition": true,
"hover": true,
"signatureHelp": true,
"goToTypeDefinition": true,
"documentSymbols": true,
"findReferences": true
},
"editor.codeActionsOnSave": {
"source.organizeImports": true
},
"go.buildOnSave": "off",
"go.vetOnSave": "off"

What did you see instead?

everything going well ,but the outline Explorer Tab shows

No symbols found in document

use shortcut Ctrl + Shift + o to Go to Symbol in File shows

No symbols found

when I set "go.useLanguageServer": false and reload , it goes well

thanks for help