[BUG] Manually setting game framerate doesn't work on Editor preview

Cocos Creator
1 
protected onLoad(): void {
    game.frameRate = 30
    console.log("ON LOAD CALLED!!")
}

This code doesn’t work on Editor preview but somehow works on Browser preview. I find it to be a bug since it should work on Editor Preview. Will there be a fix for this? console.log appears but the game framerate remains at 60.