Hey,
I believe this was a bug a while ago, however, I couldn't find the post surrounding it - sorry if this is a duplicate.
However, currently, the LinkedIn icon does not appear on the community profiles:
And it is just a white square next to the twitter logo.
I cant seem to see anything obvious in the chrome inspect elements to suggest why its not appearing, and just for a test, it does not appear on Chrome (logged in), Chrome (logged out and incognito), or Edge.
It is also not just my profile:
Thanks!
TheOC