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When selecting multiple files, then using the context menu to call one of the "copy as tag" commands, the command is applied to all the files. (I love this, btw.)
However, I set keybindings for the "copy as tag" commands, and when multiple files are selected and the keybinding is used, only the first file selected is copied. Edit: I found that this behavior also occurs when calling the command from the Command Palette.