Thank you Baker!
Can't tell for sure, but I used tor (w/o brave) vefore, and in my browser saw an id other than 000000 as well after posting.
Re-loaded the page via clearnet in another window & browser parallel, and my very same post there had id 000000.
So I think it might be some kind of bug or internal thing – other anons, as I believe, will see 000000 even though in your browser it might look different sometimes.
Just a guess though ….
>downloadable zip of all qposts
https://mega.nz/#F!iLwgXKRb!XvA-cUt5-8XyRPlgoVH-FQ
extractQ.zip