Cisco CSG sh mod csg X stats extensive checksum errors

2 CSG in FT scenario (active-standby). During normal work you can see extensite checksum errors with "sh mod csg X stats":

cisco-csg1#sh mod csg 2 stats
Connections Created: 220120
Connections Destroyed: 219713
Connections Current: 407
Connections Timed-Out: 0
Connections Failed: 0
Server initiated Connections:
Created: 0, Current: 0, Failed: 0
L4 Load-Balanced Decisions: 220120
L4 Rejected Connections: 0
L7 Load-Balanced Decisions: 0
L7 Rejected Connections:
Total: 0, Parser: 0,
Reached max parse len: 0, Cookie out of mem: 0,
Cfg version mismatch: 0, Bad SSL2 format: 0
L4/L7 Rejected Connections:
No policy: 0, No policy match 0,
No real: 0, ACL denied 0,
Server initiated: 0
Checksum Failures: IP: 6770821, TCP: 0
Redirect Connections: 0, Redirect Dropped: 0
FTP Connections: 0
MAC Frames:
Tx: Unicast: 0, Multicast: 118, Broadcast: 0,
Underflow Errors: 6815443
Rx: Unicast: 751, Multicast: 10, Broadcast: 0,
Overflow Errors: 0, CRC Errors: 46627
cisco-csg1#

Cisco TAC writes about it:
"As you are running replication it is normal to see packets with wrong checksum on FT VLAN. This comes from the way CSG communicate new sessions and tear downs to standby CSG. This is done through "fake" SYNC and RST packets send over FT VLAn and these packets doesn't have correct checksum. If you have possibility to collect sniffer traces with VLAn tags in it you should see that those are only frames on FT VLAN."