P: Drag duplicate layer to another document doesn't work anymore

Only on macOS !

Must be something with certain configurations, I'm not having the problem here. Win 10.

Thanks for reporting. This is being worked on.

Yes this did work for me - thanks Mark - but how flipping
annoying is this bug!

Share your working zone between the 2 documents and you will be able to copy everything to slide

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Using the 2 mouse method will drag the whole layer including the filter. You are correct.

However it doesn't work just dragging just the filter in to place on a layer.

You can use the 2 mouse button trick I mentioned above or drag the document tabs out into floating windows and then you can drag the layer or smart filters.

Well that is very strange.  I can confirm Mark Lee's temporary workaround did work for me on my PC version with a two button mouse :).

I just discovered the bigger problem with this issue is that now smart filters can't be copied from one document to another. 

I see this as a major issue as I copy smart filters often between documents and now I have to duplicate each step of each filter in every document where I want the same settings for the filters

I did find a temporary workaround on accident... If you hold down both the left and right mouse buttons and drag from the layers tab then it works as expected but that is too much work... lol... If you are one of those Mac one mouse button'ers you may be SOL.