ORA-600 [ktbdchk1: bad dscn]

This weekend I was responsible for a switchover of one of our databases. All went fine until the rman backup check - I discovered then that again I hit the bug described here. As I knew it already, I was confident I will soon go to sleep, but then I once again looked at the alert log and found there

ORA-00600: internal error code, arguments: [ktbdchk1: bad dscn], [], [], [], [], [], [], [], [], [], [], []

This is a database on 11.2.0.2 version, which is very important here. On first sight I have found that exists on the Metalink a bug (Bug 8895202: ORA-1555 / ORA-600 [ktbdchk1: bad dscn] ORA-600 [2663] in Physical Standby after switchover (Doc ID 1608167.1)), which happens after switchover, but version 11.2.0.2 covers also a patch for this one. And there are no other descriptions for that version, so there are only some suggestions, what to do to make the possible bug finding easier.
However when I read everything I have found that the fix is disabled by default. So I enabled it according to the article above and even though I was not sure if this is it (the trace messages were different than the ones provided in Metalink), it helped.
Please keep in mind the fix may blow up some queries, so one have to enable also another parameter (Bug 13513004 - ORA-600 [ktbgcl1_KTUCLOMINSCN_1] on blocks fixed up by 8895202 (Doc ID 13513004.8)).