Bogofilter with Claws Mail, seems not to act on spam

[Adrian]

Narrowing down the problem.

$ mv wordlist.db wordlist.orig.db
$ bogofilter -s -v -B INBOX/63956
# 92 words, 1 message
and a new small wordlist.db is created

$ bogoutil -l wordlist.db <wordlist.txt
$ bogofilter -s -v -B INBOX/63957
# 0 words, 0 messages

There seems to be nothing odd about wordlist.txt.

Even if the message had been learned as spam before, it should surely
update the counts.