If a discount only applies to pricesets, then events can sometimes offer the discount even when they shouldn't

1. In a stock demo install, configure a discount for the supporter $5 pricefieldvalue in the "help support civicrm" priceset. Leave everything else except the mandatory fields blank.
2. Note that this is pricefieldvalue 3 in the db.
3. Visit event id 3, the rainforest tournament. The discount box is showing. It shouldn't be.

I'm not a heavy user of the extension and not familiar with the code, but these lines don't seem to make sense: It looks like they compare the event id to a pricefieldvalue (what it calls price set ids seem to be pricefieldvalues).

https://lab.civicrm.org/extensions/cividiscount/-/blob/8e1d6d356022c4d1aea052d687c42284f8e4b8f1/cividiscount.php#L126-130

      $ids = _cividiscount_get_discounted_priceset_ids();

      if (!empty($ids)) {
        if (in_array($formHelper->getEventID(), $ids)) {
          $addDiscountField = TRUE;