two-for-loops-with-barrier-function reading uninitialized variable?

It seems like this graphicsfuzz test is reading an uninitialized variable here:

https://github.com/KhronosGroup/VK-GL-CTS/blob/main/external/vulkancts/data/vulkan/amber/graphicsfuzz/two-for-loops-with-barrier-function.amber#L74

The test can hang depending on the value that's read. Is the test expecting the variable to be zero initialized?

Start with external/vulkancts/data/vulkan/amber/graphicsfuzz/two-for-loops-with-barrier-function.amber at line 74 and inspect how the variable is used around the two loops and barrier. Run the affected graphicsfuzz test to confirm whether the uninitialized read can cause a hang, then establish the expected initialization behavior and verify the test completes reliably.

Written by the indexing model from the issue text.