No client warning on tombstone threshold

It appears that a client warning is not coming back for the tombstone threshold case. The batch warning works.

Repro:
Create a data condition with tombstone_warn_threshold < tombstones < tombstone_failure_threshold
Query the row

Expected:
Warning in server log, warning returned to client

I'm basing this expectation on what I see here

Observed:
Warning in server log, no warning flag in response message.