Now I recall I have had a similar situation on reddit. I could see my post as normal, quite disappointed due to no feedback. But next day I couldn't see it on another computer! And it was still visible as usual when I was logged in as checked again later. Apparently post was flagged by sub moderator. But I couldn't tell. No signs it was censored.
Very annoying thing to get caught in such a dirty play.
Reddit is almost a synonym for shadowbanning and similar practices. Even their CEO was caught stealth-editing comments he did not like:
https://www.theverge.com/2016/11/23/13739026/reddit-ceo-steve-huffman-edit-comments