Hey there - I'm not sure if this will work for you, but it did for me...
I was having issues with my snippets not working in Gmail, but I noticed that they worked in a private browser, so via a process of elimination, I found out that the issue was the Pocket Extension.
After also checking in the Chrome Web Store, other people mentioned that the Pocket Extension was messing with the browser code, so I disabled Pocket and everything is back to normal.
Hope this helps!!
