Check these common issues when doing asset ingestion along with their solution:Common Asset Ingestion Issues & Solutions The most common solution is to disable the "DAM Update Asset" and "XMP Writeback" workflows. Then ingest the assets, and if you need to run the workflows then you can run them aft...
Check the XML, and look for <dc:format> is it image/svg+xml ? or a different format?You can also add a rule using wildcards to cover if the mime type has a prefix to it, like: .*image/svg+xml
Please make sure that the favicon node in the publishers has jcr:read access for the everyone group. Alternatively, place the favicon file directly on the cache folder and name it favicon.ico