Hi,
1: I dont see any known bug in the release notes.
2: The route is active for for 5 minutes 30 seconds when you printed the output of get route id, can you please check the 'get event' and 'get log sys' for the same time when this route became active. This may indicate any trigger.
3: Can you configure route-deny on the eth0/0 to see if this helps. set int eth0/0 route-deny
Thanks,
Vikas