Leashed a couple of aurochs. They were gone after a few hours. Figured i missed the window.
Was taming a new auroch. After 2 fights leashed it, and leashed a new wild auroch. Few hours later the new auroch is gone, old one still there.
They just seem to randomly despawn without giving a chance to tame. I think in addition to fixing this bug the time period for taming should be expanded. This is near impossible for a hermit with a full time job to accomplish without having to wake up in the middle of the night.