I'm having the same problem in version 1.12.2 when I try to connect to Realms. The problem is intermittent and only seems to happen to me (3-5 people play on my Realms server). For the 10-20 seconds that I am logged into realms, I can move around but I can't interact with any blocks. The world seems to run on, only my actions aren't processed (for example, I will log in, wait 20 seconds, get booted, log back in, and be killed by a hostile mob, then booted again).
Hello, I was redirected to this page as my bug report was seen as a duplicate, even though like Nathaniel, I don't own Xbox Game Pass and have owned my Minecraft Titles for multiple years. I don't believe my issue is a duplicate of this, if this one has been resolved and only affected Xbox Game Pass users. As I still have yet to receive a fix besides using the old launcher.