Here's where I think the problem is: the scale at which you are animating. See my screenshot. On the stage, your asssets are incredibly small (3.2%). I think what's happening is, upon publishing/exporting, the vectors are scaled so small, that some of the vectors are not able to render as you drew them. This happens often enough. I think you need to re-think how you have set this document up. Instead of having the symbols so small on stage, set them to 100% and use the camera to zoom out. I'll keep looking and testing today.
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