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@joevt! I also have an iMac 14.2 with the features described in my signature.
I've never noticed if Finder windows cast their own shadows after waking the Mac from sleep mode, but I've only noticed that some icons disappear in the right menu bar.
Unfortunately I don't have the Mac at hand and I can't check whether the Finder’s shadows disappear for me too.
However, you can try the method that I have indicated to everyone several times to make all the icons reappear without needing to click one at a time in the empty spaces.
Try it and let us know if it also works with shadows; perhaps the news can be useful to the OCLP Developers.
Open Terminal and type