Desynchronization in spectate mode

[kimden]

Description

When using spectate mode, the start of the game may be not synchronized with the spectator's client, thus being awful to watch. Happened to many players.

You can easily determine that you are experiencing this bug by the starting labels: when "Ready!" and "Set!" do not appear and "Go!" appears immediately, the bug happens, otherwise it doesn't.

Rejoining the game as a spectator works well, as nothing was changed in the part of live joining during the game.

Steps to reproduce

1. Join any server with spectate mode available and turn it on (or join a server with forced spectate mode for players, like tournament or speedrun servers).
2. Wait until the game starts
3. With some probability the view is normal, and otherwise the game lags.