failed

In my world, leather, mail, gold, and diamond armor that I had in the armor supports disappeared, all the horses that I had in the stable with their iron, gold, and diamond armor were also erased, and likewise the skeleton horses also disappeared. the villagers that I transformed with a lot of work from zombie villagers and that cost me a lot to make them exchange the enchantments and objects that I wanted, it is worth mentioning that they were all labeled so that they would not disappear and I can't find a reason why I did everything already mentioned, adding It is a survival that I have been working on for a long time and it is very annoying that this happens, thank you in advance for your understanding