go tool doesn't exclude _ folder

gistfile1.sh

go version
# Tested with:
# go version go1.17.6 linux/amd64
# go version go1.18.3 linux/amd64

pwd
# /tmp/go-test

go mod init example.com/user/go-test
# go: creating new go.mod: module example.com/user/go-test

mkdir _data
sudo chown root:my-user _data
sudo chmod 700 _data
go mod tidy
# pattern all: open /tmp/go-test/_data: permission denied

As stated in go docs, _data folder in above case should not lead to a permission denied error:

Directory and file names that begin with "." or "_" are ignored by the go tool, as are directories named "testdata".