found some bug:
root@GI-FW-2:/var/lib/spamassassin # ls -l
-rw------- 1 root root 12288 Mar 23 13:13 auto-whitelist
This produced the following message:
auto-whitelist: cannot open auto_whitelist_path /var/lib/spamassassin/auto-whitelist: Permission denied
After changing owner and group to amavis, everything is fine.
(Latest Community ISO)