David,
Yes, there is a block. I was confused by so many comments and I wasn't really answering the question objectively. I was thinking of the other comments, not the ones on redditposh. Now I'm clearer. Apologies for the delay in interpretation 😖
I remembered that it happened to me right away, on the same subreddit. In this case, r/blackandwhite doesn't let our bot “grab” the link. It blocks it.
https://peakd.com/hive-142159/@cryptoreforma/round-grey-eng-pt
https://peakd.com/hive-153349/@cryptoreforma/portrait-photography-round-80-photofeed-contest-eng-pt
I think there's nothing we can do from our side. According to my friend who is more experienced in this network, these are security blocks on some subreddits.
If it happens, I wouldn't advise deleting the post and publishing it on another subreddit. Or if you do, change the title and image later.
The suggestion is not to post in that subreddit anymore, there are many others.✌️
Translated with DeepL.com (free version)