Hmm… Are you using display or logging like @info? Maybe Atom is not thread-aware. Since it’s from Atom’s internal, I think it’s better to try this outside Atom.
If you want to do this inside Atom, I think it’d be better to come up with an MWE and report a bug.
ThreadsX.jl still contains some functions that deos not exist in Folds.jl (e.g., sorting). So, using it is still totally fine. Though I imagine it’s a bit confusing that they have some overlapping functionalities.