I usually produce graphics with Mathematica and then use Keynote (I am on a Mac running the latest Big Sur OS) for post processing. Until version 126.96.36.199 I would directly highlight the graphics in Mathematica, copy it (Cmd+C) and then paste it (Cmd+V) directly in Keynote; this would produce a perfect vector copy of the image which I could work on (looks to me a PDF). However in version 188.8.131.52 this does not work anymore: as I try to paste the image in Keynote I get a message saying that "The image type is not supported on this device".
Of course I could always export the figure to PDF and then import it in Keynote (there are however issues in 184.108.40.206 when exporting, which perhaps make for another question), but it is a much less practical work-flow.
So, I was wondering if any of you knows if this change in the figures' format stored in the Clipboard was intended/planned or it is a side effect/bug.
EDIT 1: Inspecting the clipboard content it looks like Mathematica 220.127.116.11 paste graphics in SVG format (which however appears as plain text in the clipboard) whereas Mathematica 18.104.22.168 is using TIFF (which is correctly interpreted as an image). Not sure there is a Mathematica option that allows to control the default format for images put in the clipboard.