WWDC21 ray tracing sample GPU hangs

I updated my MBP 16" into macOS 12 beta and downloaded Xcode 13 & hybrid rendering sample. (https://developer.apple.com/documentation/metal/rendering_reflections_in_real_time_using_ray-tracing?language=objc)

I run the sample but Xcode tells me GPU timeout has been occurred.

2021-06-10 01:50:53.303115+0900 HybridRendering[2259:105212] Execution of the command buffer was aborted due to an error during execution. Caused GPU Timeout Error (00000002:kIOAccelCommandBufferCallbackErrorTimeout)

2021-06-10 01:50:53.303324+0900 HybridRendering[2259:105212] Execution of the command buffer was aborted due to an error during execution. Caused GPU Timeout Error (00000002:kIOAccelCommandBufferCallbackErrorTimeout)

Error Domain=MTLCommandBufferErrorDomain Code=2 "Caused GPU Timeout Error (00000002:kIOAccelCommandBufferCallbackErrorTimeout)" UserInfo={NSLocalizedDescription=Caused GPU Timeout Error (00000002:kIOAccelCommandBufferCallbackErrorTimeout), MTLCommandBufferEncoderInfoErrorKey=(
    "<errorState: MTLCommandEncoderErrorStateCompleted, label: ThinGBufferRenderEncoder, debugSignposts: (null)>",
    "<errorState: MTLCommandEncoderErrorStateAffected, label: RaytracedReflectionsComputeEncoder, debugSignposts: (null)>",
    "<errorState: MTLCommandEncoderErrorStateAffected, label: (null), debugSignposts: (null)>",
    "<errorState: MTLCommandEncoderErrorStatePending, label: ForwardPassRenderEncoder, debugSignposts: (null)>"
)}

It seems the intersection code in AAPLShaders.metal occurs the timeout error...

...
auto intersection = inter.intersect( r, accelerationStructure, 0xFF );
...

I have troubles on Radeon Pro 5500M however Intel GPU and M1 MacBook Air doesn't. Is there any workarounds to run on Radeon?

Thanks!