There are a bunch of enemies that literally make the hammers disappear as soon as they get close to hammers. Im playing hammer throw with decay aura. One example : https://imgur.com/a/D2fwu8N maybe its related to the arena, but i doubt, I ran around and it didnt matter where, the hammers kept disappearing as soon as bear came close. gladly he got 1 tick of the damage every time, so I managed to kill it somehow, but after then i ran into a pack of mobs with same shit. 
This will be fixed in 0.7.5, thanks for the report!
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