I work for a big company where we create illustrator files with multiple artboards in them (kinda like a sequence) and then export them as PNG for our website.
Its a type of a users manual. We have to crop our artwork with masks, so that one artwork doesnt overlap the other. To do this, we use clipping masks. While my coworkers make the mask over the artwork, which groups all the layers together, I greate a new layer, make it a clipping mask and then drag the artwork into that clipping layer, so I can keep my layers, since I like to name them all fancy. Now we have a big exporting issue... the clipping masks can be easily exported with "export for screens" and it exports all the artboards as individual png files in 2 different sizes.
This doesnt work for the clipping layers I make. If I export my files with "export for screens", whatever was cropped by my layer mask on artwork A shows up on artwork B. I noticed that this only happens in png, jpg and pdf are fine.
Does anybody have any idea how we could resolve this issue? Also, this has to be a bug, right?

For a while, I was using a plug-in to export my artboards, but now we need a solution that works for "export for screens" only.
Maybe there is a plug-in for "export for screens" to make it work? Or what kind of format would you recommend, if we cant make PNG work?

I hope I explained it well enough, its really complicated. I am happy for any kind of input. Below you can see a faulty PNG. Its from a sequence about a surgical approach in the hip of the dog. In png, the *** from the dog in the image beforse shows up over the next image.