Direct Offline Processing Not Working

I have some vocal delay throws happening on this one event and nowhere else in the song. Seems like a perfect place to use Direct Offline Processing. I’m using Echoboy going into Roomworks SE. Dragging them onto the DOP box with that event selected actually doesn’t work. The Echoboy is just not processing any delays, and that’s reflected in the event’s waveform.

Does DOP just not work with some plugins or something? Seems bad. What’s strange is that it actually did process the delays onto the waveform for a hot second. Then I changed some parameters and Cubase never did it again. I even restarted Cubase thinking it may be some bug, but it didn’t help.

Anyone else have this issue or something similar?