Premiere Pro & Media Encoder restrict H.264 4:2:2 10-bit hardware decoding to 1080p only on RTX 50-series (Blackwell)

I have uncovered a critical issue/artificial limitation in the current build of Premiere Pro and Media Encoder regarding hardware decoding on the new NVIDIA RTX 50-series (Blackwell architecture) GPUs, specifically the RTX 5070 Ti.

System Specs:

• CPU: Intel Core i9-13900K

• GPU: NVIDIA GeForce RTX 5070 Ti (Blackwell)

• Driver: NVIDIA Studio Driver 610.62

• OS: Windows 11

• Premiere Version 26.3.0 (Build93)

• Media Encoder 26.3.1 ( Build 1 )
   

The Bug: The new NVDEC block in NVIDIA Blackwell GPUs natively supports hardware decoding for H.264 / AVC High 4:2:2 10-bit files. However, Adobe's software seems to have a hardcoded resolution cap that breaks this functionality for 4K media.

1. When playing a 1080p H.264 4:2:2 10-bit file on the timeline, Premiere Pro successfully engages the GPU. The Task Manager clearly shows active GPU Video Decode utilization, and playback is perfectly smooth.

2. When playing a 4K (3840x2160) file with the exact same codec parameters (Sony XAVC S 4K 50fps, H.264 4:2:2 10-bit), Premiere Pro completely ignores the GPU and drops decoding entirely onto the CPU.

3. Media Encoder behaves even worse: when trying to transcode or create proxies from these 4K files, it bypasses the GPU for decoding. If software decoding is force-disabled via the Console (DVAFM.Block_H264_SW_Codec -> true), Media Encoder instantly crashes with: "Frame substitution recursion attempt aborting after multiple attempts... Inserting black for frame number 0."

Your software clearly understands the new Blackwell NVDEC capabilities because it works flawlessly at 1080p.
However, for 4K resolutions, there is an outdated hardcoded rule or profile check inside the Adobe importer module that automatically routes H.264 4:2:2 10-bit to the CPU, completely ignoring the fact that the new generation of GPUs can handle this resolution natively.

Please update the hardware decoding capability whitelist/profiles for the RTX 50xx series to allow 4K+ resolutions for H.264 4:2:2 10-bit files. We are paying for premium subscriptions and top-tier hardware, and this artificial software bottleneck is unacceptable.