ngx.worker.id () is always 0 on windows

[156704883]

openresty version 1.19.3.1
nginx.conf worker_processes 4;
init_worker_by_lua_file resty_test/init.lua;
init.lua
ngx.log(ngx.ERR, "init worker: ",ngx.worker.id()) -- It's ngx.worker.id() always zero here