IN operator does not work

I noticed that using the IN operator with a sub structure has stopped working:

select s.client_ip.ip from dfs.asa.`/processed/venuepoint/transactions` as s where s.client_ip.ip in ("unknown") limit 2;
Error: PARSE ERROR: Encountered "\"" at line 1, column 103.
Was expecting one of:
...
SQL Query select s.client_ip.ip from dfs.asa.`/processed/venuepoint/transactions` as s where s.client_ip.ip in ("2.69.200.113","unknown") limit 2
^
(the hat should point at the _ip part of the where clause)

I will report this in Jira and mark it as a blocker.

The IN works with nothing here using the latest 1.6-SNAPSHOT