Thanks for the suggestion. My default class was set to No Class, and the Revert to Default Class At setting was set to End of Game. I also did not have any Class Selector, Designer, or Teams Setting Device in the project, I also made sure I did not have more than 1 island settings object in the world.
As per your suggestion, I added a Class Designer Device (I tried both No Class and Class Slot 1 in the device and island settings), and enabled Override Spawn Immunity Time as well as set Spawn Immunity Time to 0.0 in the Class Designer… Unfortunately immmunity is still default in playtest. I was unable to test player collision because it is not an available option outside of island settings.
The weirdest thing is still that both spawn immunity and player collision works properly even after death in UEFN “Start Game” mode, even without the Class Designer Device, but as soon as it’s been uploaded to private version or set as a playtest it no longer works properly… This makes me more inclined to say it’s a bug rather than a settings issue.