Demo can't display first person view properly

So, I'm having a problem viewing this demo in first person view.



This demo works well before, but after a while, there are spectator black bars and the demo didn't show first person view after opening it. I need to press CTRL and select first person. (The black bars in the picture above is from editing)



However, it still has the black bars and no shooting animation. And then I found that the EVENT button still contains the commands that I made before.



I used HLAE's tools to try to fix the demo but with no luck. I need some helping fixing this demo so I could record the first person view. Btw, the demo is created by steam version of the game.

I did try dem_forcehltv 0/1, but nothing changed. Demo started at a locked free camera. There are still spectator black bars and no shooting animation. I wonder if the lastest update messed it up...