Race prediction not working for events with course since 19.34

Device: Fenix 7 Pro Sapphire Solar

If I create an event in Garmin Connect (android app), and add a course to the event - the event shows up on the watch after syncing as expected, but going to the race widget does not show any time predictions. It does show the elevation profile for the race though.

If I instead create an event without a course, and sync that to the watch, I get a time prediction for the event (ie the same as the standard race prediction times, as the race was a marathon in this case). If I now add a course after the fact, the event on the device does not updated, and still shows the same predicted time, and does not show a height profile.

I'm sure this worked in previous firmwares, and seems like something that was broken with the recent update to race predictions.