Tensor-likes are not close: test_mxfp8_mxfp4_matmul on PVC with Kobuk

[kwasd]

Describe the bug

PR checks are blocked by this failure
https://github.com/intel/intel-xpu-backend-for-triton/actions/runs/19070147383/job/54472588790

language/test_matmul.py::test_mxfp8_mxfp4_matmul[0-True-True-float4-float8e5-False-False-False-3-128-256-128-1024-512-512] - AssertionError: Tensor-likes are not close

>       torch.testing.assert_close(ref_out, output, atol=1e-3, rtol=1e-3)
E       AssertionError: Tensor-likes are not close!
E       
E       Mismatched elements: 2069 / 524288 (0.4%)
E       Greatest absolute difference: 54.87181854248047 at index (399, 467) (up to 0.001 allowed)
E       Greatest relative difference: 40.02494812011719 at index (143, 159) (up to 0.001 allowed)

Environment details

Triton: e427f29
GPU: Max 1100
OS: Ubuntu 24.04
Driver: LTS2 KMD, Kobuk IGC 1188