couldn't find the bug tracker so I'll put it here. Not that it is actually a bug...
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$plg_templates->set_var('pi_codeversion', $plugin_code_version );
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$plg_templates->set_var('pi_codeversion', $code_version );
It really doesn't make any practical difference. It just doesn't display the "N/A" if there is no plugin version discovered by PLG_chkVersion().