Horse and Tropical Fish pets disappeared

I was playing on a friend's world, who's the owner of the world on an Xbox One. I am playing on PC. I keep my horse in a 2x2x2 hole and my little tropical fishy in a 1x1 water hole. The last time we joined this world was on Jan. 30th. We joined into the world today and my horse and tropical fish have vanished completely.

I don't know how to replicate it. I just had a normal horse with a saddle and armor on it. It vanished from my hole I made for it.

I sincerely hate this version of the game. I would never play it again if my friends could play Java. Literally every single time I play I have an issue on Bedrock edition.

Oh nice, the mending villager I took an hour to get is also gone. I love you Mojang Studios.