From my experience most of the time companies/teams didn't even try to implement Scrum. Like having multiple product owners, skipping meetings, inventing new meetings, product owners not attending sprint planing or developers not caring about the process at all. The product owner is a single point of failure. If he does not work well it is hard for a team to deliver. In most teams I worked so far team members haven't even read the Scrum Guide nor gotten any training and didn't care.