Issue with Currency Converter remembering the discarded card when it shouldn't

**Describe the bug**
I have Sefris of the Hidden Ways + Preston, the Vanisher + Currency Converter on the field. I discarded Toxrill, which triggered both Sefris and Currency Converter. I resolved the Sefris triggers first which resulted in me reanimating Toxrill, which triggered Preston to make a token copy of it. I then chose to keep the token and send the real Toxrill to the graveyard. Finally I resolved the Currency Converter trigger and it ended up exiling Toxrill.

**Expected behavior**
I expected the Currency Converter trigger to fizzle since the Toxrill card in the graveyard is not the same one that initially triggered it.

**Desktop (please complete the following information):**
- Forge Version: forge-gui-desktop-1.6.65-SNAPSHOT-09-09