Hi guys I just discovered this thread…had the same problem too, thanks for sharing the solution. I amended convert_resize_image() in backend.py to 512x288 in the signature instead of 336x336 and it now works with Qwen3 
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Will have to rem to change it back if using Qwen2 tho!
Would be great if the Qwen2 and Qwen3 models were compiled to accept a range of image sizes, or at least, the same image size.