Has anyone here found a fix for this? This is still broken for us with Shaka and Safari 15 (desktop and iOS), and appears to still be broken in the 15.1 beta.

Did you ever find a solution to your problem? I have a similar issue, where chunks of a CMAF stream aren't retrieved and I get a DecodeError (6) and NETWORK_LOADING state if I inspect Media and MSE debug traces, but I can't figure out why. This was working fine until recently.