Stripe donations made from after updating to GiveWP 2.20.0 do not trigger Zapier actions.
The donations are not added to the zap batch at all.
The workaround, for now, is to change the donation status to Pending, save, change back to Complete and save. Note: This will also trigger a donation email receipt to the donor so you might want to block outgoing emails before doing this so that you don't confuse your donors.