Hi Aliaksei,
CSCtr16184 is not specific to single mode. Therefore multi-context mode is impacted.
The 'fix' for the bug is that upon upgrade (from pre-8.3 to a release wiht the fix), nat lines which overlap with interface IPs will have the 'route-lookup' and 'noproxyarp' keywords automatically added.
If you have an overlapping NAT line without the 'route-lookup' keyword, then yes you can manually add it to resolve the issue.
Sincerely,
David.