I've got the same problem as @Kraftwerk, and I've tried @BetterRed's solution, which isn't working for me, unfortunately. I've made sure the taskbar icon is pointing directly to the application file, not a shortcut, but no good.
Don't know if it's relevant but the problem started after I'd re-installed Windows10 and Calibre (4.22). I'd previously backed up Calibre's configuration settings from my user profile and (after reinstallation) copied them over the new configuration settings (not sure how else I should have backed up and restored these).
I've tried installing 4.23 on top of 4.22, but that hasn't solved the double icon on the taskbar problem.
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