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From the [Desktop Entry Specification](https://specifications.freedesktop.org/desktop-entry-spec/latest/exec-variables.html):

>  A command line may contain at most one %f, %u, %F or %U field code.

Try storing %F in a local variable and reusing the variable.

Also, take care: %F will in general expand to a list of files, which your current script will not adequately handle. Use %f instead if you want your desktop to invoke the command multiple times for multiple files.