My screen gets stuck on portrait when i lock rotation

Hello, when I am watching YouTube on my iPhone using the Brave App aka their browser, I lay my phone horizontally. I’d like to lock rotation the screen and keep it landscape, but for some reason every time I lock rotation when my phone is landscape, the app makes it turn back to portrait and lock that way.

Is there any way to fix this or is it an ongoing bug? I know some apps are tricky with this issue and a lot of apps are the same, just wondering if there’s a setting I can turn on anywhere to make sure my YouTube video stays landscape mode when I turn rotation lock on.

My phone is an iPhone 13 Pro Max, iOS Version 18.4.1 and my Brave App Version is 1.78.

If anyone could help me out, would be massively appreciated!