Golang x/pkgsite: go doc -http shows duplicate std search results when run from GOROOT

Go version

go version go1.25rc1 linux/amd64

Output of `go env` in your module/workspace:

AR='ar'
CC='gcc'
CGO_CFLAGS='-O2 -g'
CGO_CPPFLAGS=''
CGO_CXXFLAGS='-O2 -g'
CGO_ENABLED='1'
CGO_FFLAGS='-O2 -g'
CGO_LDFLAGS='-O2 -g'
CXX='g++'
GCCGO='gccgo'
GO111MODULE=''
GOAMD64='v1'
GOARCH='amd64'
GOAUTH='netrc'
GOBIN=''
GOCACHE='/usr/local/google/home/mpratt/.cache/go-build'
GOCACHEPROG=''
GODEBUG=''
GOENV='/usr/local/google/home/mpratt/.config/go/env'
GOEXE=''
GOEXPERIMENT=''
GOFIPS140='off'
GOFLAGS=''
GOGCCFLAGS='-fPIC -m64 -pthread -Wl,--no-gc-sections -fmessage-length=0 -ffile-prefix-map=/tmp/go-build348834898=/tmp/go-build -gno-record-gcc-switches'
GOHOSTARCH='amd64'
GOHOSTOS='linux'
GOINSECURE=''
GOMOD='/tmp/go/1.25rc1/go/src/go.mod'
GOMODCACHE='/usr/local/google/home/mpratt/go/pkg/mod'
GONOPROXY=''
GONOSUMDB=''
GOOS='linux'
GOPATH='/usr/local/google/home/mpratt/go'
GOPRIVATE=''
GOPROXY='https://proxy.golang.org,direct'
GOROOT='/tmp/go/1.25rc1/go'
GOSUMDB='sum.golang.org'
GOTELEMETRY='on'
GOTELEMETRYDIR='/usr/local/google/home/mpratt/.config/go/telemetry'
GOTMPDIR=''
GOTOOLCHAIN='auto'
GOTOOLDIR='/tmp/go/1.25rc1/go/pkg/tool/linux_amd64'
GOVCS=''
GOVERSION='go1.25rc1'
GOWORK=''
PKG_CONFIG='pkg-config'

What did you do?

Run go doc -http runtime from $GOROOT/src.
Search the local pkgsite UI for "runtime".

What did you see happen?

Package "runtime" is listed twice in the search results. Note that both results link to the same place (/runtime).

A second minor issue is that only two of the results say "standard library" even though they are all in the standard library.

What did you expect to see?

If go doc -http runtime is run outside of $GOROOT (e.g., from /), then runtime is only listed once, and every result says "standard library".

Comment From: gabyhelp

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