I haven't had any trouble on my dumb Chromecast so I think they must've pushed an update to fix the issue already. The only app I remember breaking was Jellyfin, ironically enough.
Security controls weren't the reason the devices broke, which is why applications that didn't care about things like DRM still played just fine. The internal CA for the Chromecast hardware certification expired, which requires updating all Chromecasts or temporarily ignoring the expiry date in client apps. It seems like apps are doing the latter while Google is figuring out how to update the Chromecast certificate infra on short notice.
Security controls weren't the reason the devices broke, which is why applications that didn't care about things like DRM still played just fine. The internal CA for the Chromecast hardware certification expired, which requires updating all Chromecasts or temporarily ignoring the expiry date in client apps. It seems like apps are doing the latter while Google is figuring out how to update the Chromecast certificate infra on short notice.