check.gst-editing-services.ges_basic.test_ges_pipeline_change_state occasionally fails

CI log: https://gitlab.freedesktop.org/alatiera/gst-ci/-/jobs/77320

Output

check.gst-editing-services.ges_basic.test_ges_pipeline_change_state: Failed 'Application returned 1'
       You can reproduce with: GST_REGISTRY='/builds/alatiera/gst-ci/gst-build/build/subprojects/gst-editing-services/tests/check/ges_basic.registry' GST_PLUGIN_SYSTEM_PATH_1_0='' GST_STATE_IGNORE_ELEMENTS='' CK_DEFAULT_TIMEOUT='20' GST_CHECKS='test_ges_pipeline_change_state' GST_PLUGIN_PATH_1_0='/builds/alatiera/gst-ci/gst-build/build' /builds/alatiera/gst-ci/gst-build/build/subprojects/gst-editing-services/tests/check/ges_basic

Dumping log files on failure

Dumping contents of /builds/alatiera/gst-ci/validate-output/logs/check/gst-editing-services/ges_basic/test_ges_pipeline_change_state

=================
Test name: check.gst-editing-services.ges_basic.test_ges_pipeline_change_state
Command: '/builds/alatiera/gst-ci/gst-build/build/subprojects/gst-editing-services/tests/check/ges_basic'
=================

Running suite(s): ges-basic
**
GES:ERROR:../subprojects/gst-editing-services/ges/ges-timeline.c:3107:ges_timeline_remove_layer: assertion failed: (timeline->priv->valid_thread == g_thread_self())
0%: Checks: 1, Failures: 0, Errors: 1
../subprojects/gst-editing-services/tests/check/ges/basic.c:687:E:basic:test_ges_pipeline_change_state:0: (after this point) Received signal 6 (Aborted)
Check suite ges ran in 0.727s (tests failed: 1)