It appears that in the new 1.66 patch, the onPlayerKilled function of CfgRespawnTemplates is not invoked anymore when the player dies. This is currently blocking multiple MP mods to function properly. At least Epoch and Exile are affected, probably more.
I remember that one of the perf builds before 1.66 had the exact same issue. I believe it was perf2. The change in this perf build was revoked the day (or two days) after and perf3 was released. Now it seems the same issue has slipped through the quality check and has been released.
onPlayerRespawn is still invoked as it should.