[Threshold]

Well first of all, you should probably use the OnPlayerConnect callback rather than the OnPlayerRequestClass callback. (I would recommend setting a timer in OnPlayerConnect rather than calling InterpolateCameraPos straight away)

Also, TogglePlayerSpectating to false also triggers OnPlayerSpawn, so in your OnPlayerLogin function, you are actually spawning the player twice.

pawn Код:

public OnPlayerConnect(playerid)
{
    TogglePlayerSpectating(playerid, true);
    SetTimerEx("BeginCamera", 500, false, "i", playerid);
    // Show login/register dialog
    return 1;
}

forward BeginCamera(playerid);
public BeginCamera(playerid)
{
    InterpolateCameraPos(playerid, 2365.8767, -1485.5969, 75.7918, 2132.2759, -941.1163, 109.6049, 10000, CAMERA_MOVE);
    InterpolateCameraLookAt(playerid, 2132.8271, -974.1696, 108.3467, 1720.5673, -1203.7601, 113.5448, 10000, CAMERA_MOVE);
    return 1;
}

forward OnPlayerLogin(playerid);
public OnPlayerLogin(playerid)
{
    SetSpawnInfo(playerid, 0, PlayerInfo[playerid][pchar], 1447.7323, -1663.1010, 13.5530, 1.0, -1, -1, -1, -1, -1, -1);
    TogglePlayerSpectating(playerid, false);
    return 1;
}

I'm not even sure if the timer is necessary, but it's worth a shot nonetheless. You were also missing parameters for your InterpolateCameraPos and InterpolateCameraLookAt functions, so the camera wouldn't even move at all...

References:
https://sampwiki.blast.hk/wiki/InterpolateCameraPos
https://sampwiki.blast.hk/wiki/InterpolateCameraLookAt
https://sampwiki.blast.hk/wiki/TogglePlayerSpectating