Possible Bug: Draft finals matches don't launch properly

This has happened at least twice in a row for me, so perhaps it's something more than just chance? The finals match in a 3-round draft between the two undefeated (2-0) players doesn't launch properly. At least one player is just stuck in the tournament lobby and the game window doesn't launch for them.

Start by reproducing a three-round draft where two undefeated 2-0 players reach the finals, then trace the transition from the tournament lobby to the game window. Compare what happens for both finalists and identify where the finals match launch diverges. Done means both players enter the finals game reliably; the issue does not name a file or test to run.

Written by the indexing model from the issue text.