Key change following clef change is incorrect

I have a piece in A minor. Part of the 1st movement is in A major. The clef is changing from tenor to treble AND the key signature is changing back to A minor. The three naturals following the treble clef symbol are positioned as if we were still in tenor clef. I've uploaded a screen shot of the line where the error is occurring. I can write the next six measures in tenor clef, one note will have 4 ledger lines—not ideal, but workable.

I do think this may be a bug (undocumented feature).