Update from SiteGround is that it should not be coming from SG Optimizer because that is not where their files are located. The only other minification I use is Perfmatters but I actually just started using it very recently and the issue has been coming up since long before then. I may go through the headache of disabling each plug-in one by one and re-scanning to see if I can discover if it’s coming from another plug-in…will update here if so. I can say that deleting the file does not seem to have any adverse effect on my website, but it would be nice if the file stopped creeping back.