Hi @GenericPlanner. You're running into a known limitation that the Pro-to-AIX currently has with SVG symbols. The workflow's current best practices for point symbology is described here. For custom point symbols, Illustrator (although it is a vector editor) does not consume SVGs from Pro in an optimal manner in a complicated file like a map. Further complicating the issue is that the ultimate file you are getting is an AI (not an SVG). For now, the product documentation suggests to use a simple point symbology in Pro, and then use the Maps for Adobe custom symbol replacement process (it works really fast!). I wrote a how-to post, which is step three on this page.
Here is the product doc for the automatic Symbol Replacement process as well.
For the bounding boxes that you are seeing, it is hard to tell from the image if they are clipping paths or actual artwork paths. If they are the former, you can lock all but that layer, and perform the Illustrator function to remove all clipping paths. Be aware that if you do this, you will lose the organization of those discrete symbol "packages" (an Illustrator limitation). This is why the product doc suggests the custom symbol replacement.
Hope this helps!
