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Timing issue in t5570 "daemon log records all attributes"

My understanding of test "daemon log records all attributes" is that daemon
process is started in background, some git command is executed and daemon's
output (saved to daemon.log) is compared against expected value. However
daemon.log is not a straight redirect to file -- it is being piped through fifo,
read by a loop in test-git-daemon.sh, additional processing is performed and
finally it makes it to daemon.log. All of this performed concurrently with test
execution. My question is how do you exactly avoid timing issues here? grep on
daemon.log is performed immediately after git invocation:

        >daemon.log &&
        GIT_OVERRIDE_VIRTUAL_HOST=localhost \
                git -c protocol.version=1 \
                        ls-remote "$GIT_DAEMON_URL/interp.git" &&
        grep -i extended.attribute daemon.log | cut -d" " -f2- >actual &&

how can you be sure grep operates on daemon.log that already includes all output
and not on intermediate state that is just being processed by while loop? Same
question applies to ">daemon.log" since shell might still be processing output
of previous test and its content might possibly land in the file after zeroing.

The reason I'm asking is because /bin/sh in my distribution (mksh) actually
manifests the issue -- test fails because at the time of grep output was not
processed yet (fixed by sleep 1 before grep). Also there is an issue with output
of previous test landing in daemon.log despite ">daemon.log".