Fighters who have been knocked out in training? And by who?

Recently I read that Beniel Dariush got knocked out in training before the Olivieira fight, so it had me curious as to if this is a common occurrence amongst ufc fighters. Because I’ve heard of Tony Ferguson getting KOd from a head kick and Ian Garry getting knocked out by Leon Edwards

I’ve also heard of Topuria knocking guys out as confirmed by Gilbert burns and seen footage of Strickland KOing a sparring partner.