igt@kms_async_flips@test-time-stamp - fail - Failed assertion: seq1 == seq + 1, Vblank sequence is expected to be incremented by one

https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_9192/shard-tglb1/igt@kms_async_flips@test-time-stamp.html

Starting subtest: test-time-stamp
(kms_async_flips:1260) CRITICAL: Test assertion failure function test_timestamp, file ../tests/kms_async_flips.c:278:
(kms_async_flips:1260) CRITICAL: Failed assertion: seq1 == seq + 1
(kms_async_flips:1260) CRITICAL: Vblank sequence is expected to be incremented by one(9248 != (9246 + 1)
Subtest test-time-stamp failed.
**** DEBUG ****
(kms_async_flips:1260) DEBUG: Test requirement passed: igt_has_drm_cap(fd, DRM_CAP_TIMESTAMP_MONOTONIC)
(kms_async_flips:1260) CRITICAL: Test assertion failure function test_timestamp, file ../tests/kms_async_flips.c:278:
(kms_async_flips:1260) CRITICAL: Failed assertion: seq1 == seq + 1
(kms_async_flips:1260) CRITICAL: Vblank sequence is expected to be incremented by one(9248 != (9246 + 1)
(kms_async_flips:1260) igt_core-INFO: Stack trace:
(kms_async_flips:1260) igt_core-INFO:   #0 ../lib/igt_core.c:1727 __igt_fail_assert()
(kms_async_flips:1260) igt_core-INFO:   #1 ../tests/kms_async_flips.c:388 __real_main377()
(kms_async_flips:1260) igt_core-INFO:   #2 [<unknown>+0x0]
****  END  ****