スポナーをコピーして配置すると豚になってしまう！

[takochan777]

Minecraft 1.12.2
Skript 2.6.4
Spigot

                    set {_zombie} to location(-12, 59, -9, world "world")

                    set {_creeper} to location(-13, 59, -9, world "world")

                    set {_skeleton} to location(-14, 59, -9, world "world")

                    set {_spider} to location(-15, 59, -9, world "world")

                    set {_cavespider} to location(-16, 59, -9, world "world")

                    set {_blaze} to location(-17, 59, -9, world "world")

                    set {_ghast} to location(-18, 59, -9, world "world")

                    set {_zombien} to nbt compound of block at {_zombie}

                    set {_creepern} to nbt compound of block at {_creeper}

                    set {_skeletonn} to nbt compound of block at {_skeleton}

                    set {_spidern} to nbt compound of block at {_spider}

                    set {_cavespidern} to nbt compound of block at {_cavespider}

                    loop all armor stands in world "world":

                        set {_loc} to location of loop-entity

                        if name of loop-entity is "datuspawner":

                            # ランダムでモブを選択

                            set {datuspawner} to random integer between 1 and 5

                            #ゾンビ

                            if {datuspawner} = 1:

                                set block at {_loc} to block at {_zombie}

                                add {_zombien} to nbt of block at {_loc}

                            #くりぱ

                            if {datuspawner} = 2:

                                set block at {_loc} to block at {_creeper}

                                add {_creepern} to nbt of block at {_loc}

                            #スケサン

                            if {datuspawner} = 3:

                                set block at {_loc} to block at {_skeleton}

                                add {_skeletonn} to nbt of block at {_loc}

                            #くも

                            if {datuspawner} = 4:

                                set block at {_loc} to block at {_spider}

                                add {_spidern} to nbt of block at {_loc}

                            #どくぐも

                            if {datuspawner} = 5:

                                set block at {_loc} to block at {_cavespider}

                                add {_cavespidern} to nbt of block at {_loc}

これを実行しても配置されたすべてのスポナーが豚になります。
ですがnbtは正確に設定されていて、このブロックをコマンドでクローンすると正常なスポナーに戻ります。
誰か助けてください！
mob spawner nbt