I normally play using the Ender client, but from time to time I load the official client, generally to see whether it replicates some bug I've encountered with the Ender client.
I believe I last used the official client on Feb 19, to check whether it would replicate that day's Ender client bug. (It didn't.) I believe that icons appeared normally at that time.
Today I hit another bug in Ender's client. This one doesn't replicate with the official client either. It's a complete show stopper, so I attempted to actually play with the official client. From the moment I stepped outside, no icons have been visible on either the mini-map or the control-a map. I do have flags, and a red arrow indicating my hearthling's location. Nothing else.
I brought up the icon settings menu, in case the two clients controlled icon settings separately, and large groups had been turned off.
It's blank. (My screenshot came out more than 256 KiB, so I cannot upload it.)