Funny I seem to think its the opposite that Apple keeps breaking the support as they release these incremental betas. I know it was working with iPadOS 14.0 then upgraded to 14.2 beta 1 with exact same app version and it is no longer working. That doesn't point to Google in that instance. Probably blame on both sides maybe?
Nah, we were seeing changes happening between iOS builds. The instance you mentioned was just coincidental. Apple are not changing anything with the VP9 support, it was in officially as part of iOS 14.