Example of the duplicated tag:

Initial data tag: {Motion:[0:0.0d,1:0.0d,2:0.0d],ReapplicationDelay:20,Radius:2.0f,UUIDLeast:-6634945701645063245L,DurationOnUse:-1000.0f,Invulnerable:0b,Duration:600,Air:300s,OnGround:0b,Dimension:0,Effects:[0:{Ambient:0b,ShowParticles:1b,Duration:900,Id:1b,Amplifier:0b},1:{Ambient:0b,ShowParticles:1b,Duration:900,Id:1b,Amplifier:0b}],PortalCooldown:0,Rotation:[0:0.0f,1:0.0f],RadiusPerTick:0.0f,Particle:"mobSpell",FallDistance:0.0f,OwnerUUIDLeast:-6966446706607177597L,UUIDMost:-288725848190400044L,OwnerUUIDMost:2564663178710239695L,Pos:[0:168.58035530547355d,1:75.99657407350283d,2:911.448015973679d],Fire:0s,RadiusOnUse:-0.5f,WaitTime:10,Age:41}

Data tag after modifing the 'Age' tag three times: {Motion:[0:0.0d,1:0.0d,2:0.0d],ReapplicationDelay:20,Radius:1.5f,UUIDLeast:-6634945701645063245L,DurationOnUse:-1000.0f,Invulnerable:0b,Duration:600,Air:300s,OnGround:0b,Dimension:0,Effects:[0:{Ambient:0b,ShowParticles:1b,Duration:900,Id:1b,Amplifier:0b},1:{Ambient:0b,ShowParticles:1b,Duration:900,Id:1b,Amplifier:0b},2:{Ambient:0b,ShowParticles:1b,Duration:900,Id:1b,Amplifier:0b},3:{Ambient:0b,ShowParticles:1b,Duration:900,Id:1b,Amplifier:0b},4:{Ambient:0b,ShowParticles:1b,Duration:900,Id:1b,Amplifier:0b},5:{Ambient:0b,ShowParticles:1b,Duration:900,Id:1b,Amplifier:0b},6:{Ambient:0b,ShowParticles:1b,Duration:900,Id:1b,Amplifier:0b},7:{Ambient:0b,ShowParticles:1b,Duration:900,Id:1b,Amplifier:0b}],PortalCooldown:0,Rotation:[0:0.0f,1:0.0f],RadiusPerTick:0.0f,Particle:"mobSpell",FallDistance:0.0f,OwnerUUIDLeast:-6966446706607177597L,UUIDMost:-288725848190400044L,OwnerUUIDMost:2564663178710239695L,Pos:[0:168.58035530547355d,1:75.99657407350283d,2:911.448015973679d],Fire:0s,RadiusOnUse:-0.5f,WaitTime:10,Age:1}