Looking at an example test summary for an AGL job like this:

https://kernelci.automotivelinux.org:4443/test/board/qemu/job/AGL-kernel-tree/kernel/AGL-gerrit-11745-1-bdcf7a36f66076f8449c9db02dc1a0e0fe21b23f/

and specifically the "yocto-ptest" line.  It shows one test-set run, but zero pass/fail/unknown.  Clicking on it, it shows that the test status is "unknown"

So it looks like the "Unknown" count is not getting added up in the summary fiew.