100% Walsh has fucked up his handling of the Mandron goal. He almost did so well: let play continue, then blew after ball went in.
In his head there, he thinks VAR will correct his mistake. But he needs to award the goal for that to happen. If he does that, there's a clear review of the incident and if they decide there's a foul, then fair enough. Instead, he says it was a free kick and play continues, so VAR doesn't get involved.
He's hugely mishandled it. I really hope the club is (quietly, without issuing a statement) kicking off about this.