it was likely solved by having a less shiny material (0.15 roughness and above).
I’ve came across this in the worst possible way on shiny surfaces with hundreds of fireflies with no way of getting rid of them no matter what AA settings i’ve used in the movie render queue (the editor view’s path tracer had no problem with it at all for a single frame screenshot) but when ive read it somewhere that some renderers have issues with values close to 0 ive realised that is what is likely causing it, tried it and yep, that was it (well… most of it).