Steps to reproduce the issue:
Summon an area effect cloud with the paticle type ambient_entity_effect and set an color with the Color: tag
I used exactly this command:
/summon area_effect_cloud ~ ~ ~ {Particle:"ambient_entity_effect",ReapplicationDelay:0,Radius:7f,Duration:200,Color:2265694,Effects:[{Id:14b,Amplifier:0b,Duration:20,ShowParticles:0b}]}What happens: As you can see in the attached screenshot the particles are red, pink, black and blue colored
What schould happen: The correct color should be displayed
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@unknown – for the ambient_entity_effect particle, there are no additional arguments, instead the color is specified with the dimension parameters if the count is 0. (Which is really janky.)
I don't know if or how that could be transferred over to area effect clouds. So I'll confirm this but likely a won't fix.
Actually this is very closely related to a bug report that you made a few years ago, MC-123539
The Particle NBT value must match that of the /particle command, including additional arguments before the coordinates.Whoops, confused it with dust, still dumb this wasn't done for all.