Paste Global Shortcuts Not Working (Mint)

Using CopyQ 3.11.0 on Linux Mint 19.3 Cinnamon, the "Paste" global shortcut commands (i.e. paste clipboard as plain text, paste current date and time, etc) are not working:

* This is not an issue of global hotkeys not working in general, as I can assign the same hotkey (Ctrl+Shift+V) to i.e. "Show/hide the main window", and it works
* If I follow the Ctrl+Shift+V hotkey with a regular Ctrl+V, then it pastes the specified item. For example, if assign "Paste current date and time," then pressing "Ctrl+Shift+V" will put the date and time in the clipboard (but does not paste it). A following "Ctrl+V" then actually pastes it.