You can also verify whether the system actually rolled back by checking the OS build version rather than solely relying on the KB entry in the updates list.
Usually, looking at the list of updates would suffice but obviously, there is some issue with the patch (I see a duplicate entry when I installed the KB as well) so other checks should be used to validate the version of the system.
When I performed the rollback, one of the entries was removed. The other remained. However, when I checked the OS build version with ‘winver’ , the OS build did roll back to the prior version.