As stated by the heading I tried to lock a blaze spawner in a nether fortress and got a "access denied"
It used to work in the last map but isn't now. This also makes the level 3 magic mace useless in the nether if this was changed,

 

That's interesting. Last month I was able to lock in the nether. I picked up 11 blaze spawners last month

 

That makes sense. it was only happening when I entered with fly. did you want the spawners returned?
I`m not sure how many I ended up getting. They all have just 1 time use since I don’t have a boosted mace.