Yes I have the same thing:
The site works fine everywhere else, browser on desktop and mobile loads the site with no issue. No CSP violations on android browsers (chrome, FF, Opera) but in the Twitch app I get a CSP error in the webview. I can even hit the three dots in the corner and hit “open in browser” and the site will load fine. Seems to be related only to the Twitch app or Twitch CSP to me.
How would I get dev tools running for the webview in the twitch app?