Proofreading: repeated pickup not handled

My singing group sings old songs, and often their style has the pickup be present through the song. For example, I’m working on a song in 6/8, with a one beat pickup, and throughout the song, lots of the measures act as if they’re 5 beats long, with their last beat being a pickup to the next measure, and the last measure of the song is 5 beats long.

It has a segno + DS al Fine + fine, and Dorico’s proofreading Does Not Like It One Bit.

Because of the structure, the segno is on beat 6, as is the fine:

That yields two warnings:

That is the case, but those are not valid issues. For a song like this, where multiple measures within the song have the same pickup beat as the first measure, it should be expected for the segno and the fine to match the pickup beat of the first measure.

But what really is a problem is the DS al Fine at the end:

which matches up to the fact that the segno is on beat 6 as well, but the proofreading panel complains:

That is just not correct. There is no rhythmic discrepancy: the missing last beat of the measure is made up for by the fact that the segno is on the last beat of the target measure.

Can the proofreading panel be smarter for songs like this? Thanks.

Would you be able to attach a project here that demonstrates the problem?