Apple iTunes movies still juddering on playback on Roku Ultra

It's been six months, and this is still an issue! Movies I purchased from the iTunes store are still juddering and have weird motion issues on my two Roku Ultras.

It happens only on titles that have stereo audio (titles in 5.1 play fine). It happens on multiple televisions and on multiple Roku Ultra 4850x devices. It also happens when I use Airplay to start playback.

I was on the phone with Roku support for hours in May, and was eventually told that this was an Apple problem. I also went through a weeks-long support ticket with Apple in which their engineers claimed the issue is with Roku.

Is this ever going to be fixed, or will the mutual fingerprinting continue indefinitely? I've unplugged my Roku devices and am using another platform for my streaming needs until this is sorted and fixed.