Hmm, I've had one other person report this bug, and can't figure out what to make of it; I can't replicate it, and 99% of players don't seem to run into it either. Sorry! I'll keep looking into the issue. In the mean time, if you're comfortable using reg edit, you can manually edit the card into your inventory:
1. Open reg edit, and navigate to Software\OleanderGarden\Pagan3
2. Edit the inventory value, adding the string "tarot19" between two adjacent commas (this value is just a list of items by name, separated by commas, so it's hopefully not as opaque as it sounds
3. Save, and restart the game
Hope that works for you! Apologies for the inconvenience—this is proving a very strange bug to track down.