Second player issue

my main xbox account is EarthSum7050930, I had to use a separate account to send issue report. So me and my sibling both play minecraft, split screen. My sibling uses the main controller, I use the other. I log into minecraft as a second guest player after my sibling signs into the world. It worked for almost a year, but today signing in I was spawned in at world point with nothing in my inventory and unable to get pets to sit up. No amount of resetting or retrying fixed it. What to do