The problem exists in all CSGO servers that were originally from pG (TTT/JB/bhop/minigames/1v1). The servers were fine a few hours ago and after a server crash the problem arose.
I also checked CSGO servers originally from eGO and they work just fine. It displays my =(eG)= tag and sm_toggletalk and sm_psay worked when I tested it. Because of that it seems the problem only applies to servers that were originally run by pG.