I have issue with SVG generated by XD for usage in Icon Font generator. I use this one: https://www.npmjs.com/package/gulp-iconfont

There is online generator:
http://nfroidure.github.io/svgiconfont/

I attach one example file generate by XD: heart-xd.svg
Result: https://cl.ly/272g0m1g202H/Image%202018-06-11%20at%208.16.09%20odp..png

And one re-saved by Illustrator: heart-illustator.svg
Result: https://cl.ly/28382e3k2v0C/Image%202018-06-11%20at%208.16.56%20odp..png

Because if I open the svg in illustrator and re-save it, it'll work fine. I am suspecting the svg syntax in XD doesn't work properly.

I got information that XD SVG does not export bezier point data so scenario you’re describing is expected with how the feature is currently designed.

Maybe connected to this request:
https://adobexd.uservoice.com/forums/353007-adobe-xd-feature-requests/suggestions/31672270-better-svg-export