I cannot reproduce this problem, I can see emojis in the activity title or description just fine in the browser version. Could you give us an example screenshot with such an abbreviation and note what emoji you would expect instead of that?

I’m seeing it… for national flags only.  Both in Chrome and Firefox, MS Edge has always done this.  Other emojis are okay. 

The problem is only with country flags. They were replaced by countries abbreviations.