This from the same job I posted about earlier, but a different issue so here’s a new post.
There were a couple of instances of Media Encoder not playing nice with Mocha Pro 5.6 AE plugin. Here is one example. The only workaround was to export directly from AE. Haven’t really had this issue before or since.
Mocha Pro Version 5.6.0 build 1601.gcc41335b663b. Build Date Feb 2 2018
After Effects version 16.1.2 (Build 55)