Placing Spawners in Survival mode always results in pig spawners

Placing any spawner given with any NBT data in survival mode will result in a pig spawner.

Tested with these commands:

/give @s minecraft:mob_spawner{display:{Name:"{\"text\":\"Skeleton Spawner\",\"color\":\"green\",\"italic\":false}"},BlockEntityTag:{SpawnData:{id:"minecraft:skeleton"},SpawnPotentials:[]}} 1

/give @s minecraft:mob_spawner{display:{Name:"{\"text\":\"Zombie Spawner\",\"color\":\"green\",\"italic\":false}"},BlockEntityTag:{SpawnData:{id:"minecraft:zombie"},SpawnPotentials:[]}} 1