Premiere Pro beta Canon R5 8K RAW playback issues

Every now and then I test Premiere Pro beta and now with the newest beta I noticed that compared to the non-beta version timeline playback performance of Canon 8K RAW files (R5, R5C) is bad. This is both in my Windows PC and M1 MAX Macbook Pro 64GB. I get dropped frames in 4K timeline and clips scaled to 50% no matter what the playback resolution is. In the non-beta I get no dropped frames in 1/2 or 1/4 playback resolution. High quality playback is set to off in both. Adobe please check this.

My PC

AMD Ryzen 3960X

64GB

Nvidia 2080 TI