Did you get this figured out, yet? I notice that you have mismatching After Effects and Media Encoder versions. I wonder if you either need update After Effects to the matching 2019 version of Media Encoder, OR roll back Media Encoder to the matching 2018 version of After Effects that you have? The Adobe apps generally don't like it when they have to work with mismatching software versions. On top of that, Saber is a third party plug-in. While Saber is a really awesome effect, third party plug-ins can add complications. I bet having matching software versions will do that trick, but I have a few other ideas in case that doesn't fix things.