blaze spawners in the nether fortress have been turned into pig spawners and do not spawn in their immediate vicinity. overworld [zombie] spawners unaffected
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Actually... Any placed by /give and /setblock spawners will turn into a PIG spawner after first time mob spawned.
I'm experiencing this issue, too. World was generated in 1.8x. But I believe that some chunks containing pig spawners were generated while using 1.9. Altogether, the world affected has four pig spawners in the Nether where blaze spawners should be.
I have checked in 1.9.2 also in a test world was generated in 1.9. Here, the blockdata reports SpawnData{id:Pig}, even after I place a mob_spawner block that I obtained using "/give @p minecraft:mob_spawner 1 0 {SpawnData:{id:Blaze}}".
UPDATE: I was able to use the following command to make/replace my errant pig spawner with one that works. Thanks @TobiBot for getting me thinking in the right direction.
/setblock ~ ~ ~ minecraft:mob_spawner 0 replace {SpawnData:{id:Blaze}}
This worked in my 1.8x world, as well.
the seed is 1435720922980048131; it's maybe 1.7 created, issues only appeared after the recent changes to 1.9.* i just sorted that with the proper egg used on the spawner.
the steps were quite simple. you update to 1.9 walk through your nether portal towards your blaze grinder and you find it grinding nothing with a pig spawner sitting in the center.
Which version was the world generated in? Please provide steps to reproduce the issue.