Error in entity_entity_property_edit_form_validate()

I'm surprised that no one has noticed this before. The code currently looks like this:
form_set_error('selector', t('Unable to apply the data selector part %key.'. array('%key' => $part)));
but that's clearly wrong - the replacement for %key is supposed to be in the second parameter passed to t(), but instead of using a comma to separate the first and second parameters, a "." is used. That's clearly wrong, and should have been caught like 10 years ago ...