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If I understand it right, Accumulate Field node works in the order of indices.
Is there a way to reassign/change order of indices in Geometry Nodes or change the order of field accumulation?
In this particular case (Accumulate Field) you can use the "Field at Index" node to change the order of accumulation.
Lets say we want to add up the X position values:
We can change the order by inserting a "Field at Index" node. Here I'm using N-i to invert the index: