So I was on my horse and we carefully strolled down a hill and when I got to the water, I placed a boat down and I was going to ride my horse in the boat so we'd both be in there so we could travel back home. I placed the boat down, and it disappeared. I got off my horse to see where the boat went. A couple seconds pass, my game freeezes, then bam: "You died." Didn't say why, nothing about how much XP I had (a lot.) I just randomly died? And then because I broke my bed (I was traveling with a full inventory of valuables so I needed to sleep) I respawned thousands of blocks away in both directions. When I respawned, I checked the chat and it says that I fell from a high place? But I was literally on the ground in front of the water for a pretty solid amount of time. Plus my horse doesn't take fall damage for some reason and I had been riding that horse for the past half hour? I've never reported a bug before, can this be fixed? I don't want to cheat and teleport because then achievements will get turned off but I'll be really bummed if all of my stuff despawned  Super weird and random. I already started collecting supplies as I respawned because I didn't think to report it but I'm just gonna leave it alone for tonight.

(P.S: If it helps add any context, my game seems to be pretty out of whack in general. One time my laptop died and when I reopened MC, everything was fine but my horse was just gone? I had it on a lead on a fencepost, the lead was still tethered to the fencepost, but not to anything else. Just... gone horse. Also there's random chunks missing everywhere but I think that's mainly due to issues I had with my game file and having to manually re-install it in my folder etc. etc. But just all around, I have tons of issues with delayed sounds, mobs freezing in place for a few seconds at a time while I can still function normally, delayed block breaking, and a bunch of other super weird lags and glitches. Idk if that helps anyone because nothing remotely like this has happened before except for those few seconds of lag, but just some background info in case it helps! Please help me man, I had nine top-tier enchanting books )