All the diffs in the ,v file are identical to the 7.4 version up to and including version 1.230, so it appears that the corruption is in a higher, post-split, version.
Then the erroneous line shows in all checked-out revisions from 1.119 to 1.243, right? That's what I see when I compare some revisions between the pelix and wyrm (haven't compared every revision in this range though).
According to the change log, all changes up to and including 1.243 are the same on pelix and wyrm. 1.244 differ, and 1.244 is the head revision on wyrm (that change corresponds to 1.245 on pelix, according to the log message).
Could it be that the corruption is in the base contents in the head revision?