Hello. I'm not a trac user myself, but I've noticed that trac has just been removed from testing today.
AFAIK, the main reason trac was not ready for Debian 12 was the problems with python3, but those in theory have been fixed by version 1.5.4-1 (bug #1030413). Therefore: Should not this bug (#1024647) be closed accordingly? (If so, I guess you will also have to ask Release Managers for an exception so that trac enters testing again). Thanks.