Fair enough, I see what you mean with that example. Does that only happen if one of the pairs is Zapier or are there others where it does too? Your other example seems to work, and in the comments they claimed it's used too.
Not just Zapier. For example, as far as I can tell, Zapier doesn't support either Drupal or Netsuite (neither is on their list of apps), but this page exists: https://zapier.com/zapbook/drupal/netsuite/
