The hive boss doesn't work with the cold and freeze build.

In the Hive boss arena, the boss's invulnerability doesn't lift after the first stage when one of the two bosses leaves. I'm playing with Shockwave Totems and a Cold Envelope. I ran around the arena for about 10 minutes, but nothing changed, and the boss doesn't transition to the next stage; he remains invulnerable. Out of five runs, I only managed to complete one successfully. Meanwhile, my friends have had no problems with other builds.

This sounds like a repeat of an old bug that people used to get with Freezing Pulse Totems back when they were OP.

Certain monsters/bosses, most notably Izaro, could fail to transition to their next phase if they were continuously frozen for too long or frozen at just wrong time. The most recent one I remember was the t3 Azurite boss that's like a winged lion would bug out if frozen at the wrong moment, and you could never complete the encounter (without starting it over again).

Hopefully GGG can quickly find and fix it, since a similar issue has happened several times before.

One potential workaround for you temporarily would be to remove your ability to Freeze just for that boss fight (probably using Elemental Focus Support, but there are other ways).