'elements/appsrc.c' (elements_appsrc) test failure [nondeterministic]

Hi,

Rebuilding the gst-plugins-base package in Guix, I encountered the single following failure, which didn't appear in earlier builds:

 30/117 elements_appsrc                                                FAIL            8.64s   exit status 1
>>> GST_STATE_IGNORE_ELEMENTS='cdio cdparanoiasrc libvisual_ alsasrc alsasink' GST_TAG_LICENSE_TRANSLATIONS_DICT=/tmp/guix-build-gst-plugins-base-1.18.5.drv-0/gst-plugins-base-1.18.5/gst-libs/gst/tag/license-translations.dict GST_PLUGIN_PATH_1_0=/tmp/guix-build-gst-plugins-base-1.18.5.drv-0/build:/gnu/store/whw1maa6zwc3xlhv6dh1rss3lcglfayb-gstreamer-1.18.5/lib/gstreamer-1.0 CK_DEFAULT_TIMEOUT=600 GST_PLUGIN_LOADING_WHITELIST=gstreamer:gst-plugins-base@/tmp/guix-build-gst-plugins-base-1.18.5.drv-0/build GST_PLUGIN_SYSTEM_PATH_1_0='' GST_REGISTRY=/tmp/guix-build-gst-plugins-base-1.18.5.drv-0/build/tests/check/elements_appsrc.registry MALLOC_PERTURB_=6 GST_PLUGIN_SCANNER_1_0=/gnu/store/whw1maa6zwc3xlhv6dh1rss3lcglfayb-gstreamer-1.18.5/libexec/gstreamer-1.0/gst-plugin-scanner /tmp/guix-build-gst-plugins-base-1.18.5.drv-0/build/tests/check/elements_appsrc
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Running suite(s): appsrc
99%: Checks: 107, Failures: 1, Errors: 0
../gst-plugins-base-1.18.5/tests/check/elements/appsrc.c:801:F:general:test_appsrc_period_with_custom_segment:0: 'GST_BUFFER_PTS (recvbuf)' (1000000000) is not equal to 'GST_BUFFER_PTS (exp_buf)' (0)
Check suite appsrc ran in 8.577s (tests failed: 1)
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[...]
Summary of Failures:

 30/117 elements_appsrc                                                FAIL            8.64s   exit status 1


Ok:                 102
Expected Fail:      0
Fail:               1
Unexpected Pass:    0
Skipped:            14
Timeout:            0

I'll disable the test in the package.

Thank you!