I was in skyblock. I was having issues with dual monitors in another game so I shut dual monitors off and went back to normal mode. I alt tab every minute or 2 between fights so check for zombie villagers and kill any other hostile mobs. As soon as I switched back to single monitor I Checked Minecraft and I got a crash report. I tried restarting the game several times but kept crashing. Restarted computer crash. When I got back in after a free reinstall, and switched back to dual monitors. I was dead and I lost all my stuff. I was in a safe place lit up well. I place myself inside a box when I go afk so that this doenst happen. Even if its for a minute like it was in this case. Whatever the game crashed caused me to die. I can't explain the death as there isnt like a combat log. Is it possible for a roll back as this was clearly caused by an error, as my game crashed, I should have immediately also been logged out, safe and sound.
We would need exact reproduction steps. If the bug is reproduced we are able to return lost tools. This simply sounds like a faulty gaming setup on your end, and as such there is not much we can do for you.