Replays cannot be loaded if too many individual players/spectators enter/leave during the match

Replays cannot be loaded if too many individual players/spectators enter/leave during the match. Even though there is always fewer than 254 players/spectators in the match, if the total number throughout the entire duration exceeds this limit (I think it is 254, otherwise something very close) then the resultant replay cannot be loaded by the engine.

Example Log Messages:
```
[t=00:00:29.878004][f=-000001] Too many Players (256) in the demo
[t=00:00:29.878010][f=-000001] Connection attempt from UnnamedPlayer (spec)
[t=00:00:29.878017][f=-000001] -> Version: 2025.06.19 [Windows 64-bit (native)]
[t=00:00:29.878948][f=-000001] [Game::ClientReadNet] added new player UnnamedPlayer (spec) with number 0 to team 0
[t=00:00:29.878964][f=-000001] -> Connection established (given id 256)
[t=00:00:29.878978][f=-000001] Got message 49 from 256 claiming to be from 0
[t=00:00:29.878984][f=-000001] Got message 49 from 256 claiming to be from 0
[t=00:00:29.878989][f=-000001] Got message 50 from 256 claiming to be from 0
```

No files, tests, or entry points are named. Reproduce the issue by having more than 254 distinct players or spectators enter and leave during a match, then load the resulting replay and compare the log with the reported messages. Done means the replay loads successfully even when the cumulative number of participants exceeds the limit.

Written by the indexing model from the issue text.