They churn out new parts and don't bring in fixes. See all the chips in their lineup that have a USB host controller. Every one of them (they use Synopsys IP) will fail with multiple LS devices through a hub. We talked to our FAE about this and they have no plans to fix it. The bug has existed for years and the bad IP is being baked into all the new chips still. Solution? Just use yet another chip for its host controller, and don't use a hub.