Animal Despawn

I have been losing animals for atleast the last 2 weeks if not longer. Since i have taken notice i have lost 16 colored sheep in 3 different pens, 6 ocelots on leads attached to fence posts, 6 axalotles on leads in water, & today a golem on a lead. I haven't checked my whole realm yet so that number mite be higher. I know they didnt die because the posts they were attached to still have the visual of the lead wrapped around it but the lead & animal are gone. Not to mention my main white sheep pen seem very depleted along with the ocelot pen. This needs to get fixed cause whats the point if i just keep losing animals. Also those numbers are just what i have kept track of since i noticed it happening. Forgot to mention i lost 3 fast horses in a pen before today, now the pen is empty so thats 6 gone & all but one had saddles on them aswell. Plz fix this because its draining resources & some are hard to come by like saddles