It was revealed last month that X was making a major change to the block button. No longer would it perform the traditional function of stopping someone accessing your posts, leaving comments, and so on. Instead, it would just stop people from liking, replying to, and reposting content, which they can still see, essentially making it more of a mute button.
Now, X's engineering team says it has started to roll out the change to the platform's block function. Instead of blocked users seeing a "You're blocked" message on accounts, they now see a message stating "you can view public posts from [the account that blocked you], but you are blocked from engaging with them. You also cannot follow or message [the account that blocked you]."