When I do this command,
/summon AreaEffectCloud ~ ~6 ~ {RadiusPerTick:0.25f,Particle:"happyVillager",RadiusOnUse:-0.025f,ReapplicationDelay:0,Effects:[{Id:10,Amplifier:7,Duration:200}],Radius:2.55555f,WaitTime:10,Age:390,DurationOnUse:0.0f}/summon AreaEffectCloud ~ ~6 ~ {RadiusPerTick:0.25f,Particle:"happyVillager",RadiusOnUse:-0.025f,ReapplicationDelay:0,Effects:[{Id:10,Amplifier:7,Duration:200}],Radius:2.55555f,WaitTime:10,Age:390,DurationOnUse:0.0f}it summons a ring of sparkles then instantly disappears!
Set the duration to something, since it defaults to
0and the entity is immediately killed.