Cannot reproduce it. What filters are enabled in Adguard?
Do you use Opera Turbo?not user filters rules as disabling it does not change anything. also tried disabling all extensions in opera and that too did not work. a small detail I left out(sorry) is that the video plays halfway before abruptly giving me the error. temporarily pausing Adguard protection on the page still results in the error but it goes away when I shut down Adguard completely. will continue lookng into this on my end.