have you tried backing up your world first? becaue if ur using a later version that is farther than 1.7, the smapshots can corrupt your worlds... so try backing up ur worlds.
P.S. wats the funniest mob uve ever seen in minecraft?
it is not a bug, it is probably a glitch. did someone close the world or was the server/world on your computer?
my ram is 7-8 gb it sats core I7 idk what that means its all mostly up to date i have a high ssd card and my cpu and gpu are good i saw this on reddit saying things like this and everything i have fits the description because i have friends downloading this on chromebooks with no problem while im struggling with and expensive gaming laptop