wiredtiger_open() returns WT_RUN_RECOVERY when recovery is enabled

Hi!

Occasionally after non-clean shutdown (crash) wiredtiger_open() returns us WT_RUN_RECOVERY even though we don't specify log=(recover=error) config.
If I understand documentation correctly when no value for log=(recover) is given WiredTiger should perform recovery automatically if it needs to.

On next open it recovers without any problems.

Unfortunately I have no DB/test now, but maybe it's something known (already fixed)?

Thanks!