After installing the new version, I went to minecraft as usual, to my old world. Then he saw that I was missing: "Copper (all copper, from ore, ingots, blocks in a chest, to a lightning rod). Iron golems, residents (ALL), cats, dogs, even my horse skeleton (. Lost path. Mine a small building made of blocks of copper also disappeared, leaving the vines hanging in the air, but what scares me the most seems to be that all the copper ore from the world I loaded has disappeared.
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You know that 1.16 isn't 1.17 right? if not this one is on you.
What you said disappered is 1.17 items and then you opened it in 1.16 where it doesn't exist
See MC-211308.
I don't recommend you going in old worlds in newer versions. it's not the community's/mojang's fault that you lost your pets and other stuff.
You might have wanted to backup the world, if you did not, then i am sorry, there is no way other than cheating to get your pets and stuff back.
this issue report will also have to be closed. (I am not a moderator, but I suggest that)
Because you broke your own world by loading it in a newer version. especially snapshot.