BUG - Game incredibly slow/freeze at start because because of 1 player.

[guerringuerrin]

@ffm2

3 different saves from the same game. 

savegame-0014.0adsavesavegame-0013.0adsavesavegame-0012.0adsave

[hyperion]

Merged https://gitea.wildfiregames.com/0ad/0ad/pulls/8329, which fixes a probable cause of what we see here, at least this bug should result in pretty much what is described in here. @elexis spent some considerable time trying to debug this.