Close timing of relic refining in endless mission, right before next wave starts, results in endless loading

[Retrospecter]

I had selected a relic, and between everyone else having selected theirs and the start of the next wave, I attempted to refine mine, which resulted in a non-resolving "loading..." icon, and a complete inability to move, talk, or select to leave/stay after the round, ultimately requring shutting the game down. My assumption is a failed mission after everyone else left would have resolved it, but did not test.