I was playing hunter in the evil solo adventure, 5th part facing Lilayell. I receive Frostmourne from an Arfus. After using up all 3 of the durability on minions, none of the killed minions spawned on my side. My board was empty and they were killed with my weapon. This happened twice. Same run, same boss.
This has been happening to me as well, both in Solo play and in ranked.
Frostmourne killing multiple minions but never summoning them on the deathrattle. This is both from weapon destruction and naturally losing durability.
This is now listed as a known issue:
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