Steps to reproduce:

1.  Create a new Unity project
2.  Copy the attached compute shader to the Assets folder
3.  Inspect the compiled code for Vulkan, Metal, or OpenGL ES

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Actual results: 
The read from _BufferB happens unconditionally, leading to undefined behaviour.

Expected results: 
The read from _BufferB should happen only if the condition (_BufferA[tid] < _BufferBLength) is satisfied.

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Reproducible with versions: 
6000.5.0a1, 6000.4.0a1, 6000.3.0a1, 6000.2.0a1, 2022.3.0a1