Tied notes result in chords

Here's what happens. If you enter a note that ends a measure then press + to make the note tied to a note in the next measure, if there are any existing notes you will end up with a chord in that measure rather than overwriting the note as expected.

Here is a sample situation:

Enter a 1/2 note and tie a 1/4 note to it (by pressing 5+) and this is what you get:

If you enter a dotted 1/2 note rather than the half note the affected notes in the second measure are replaced as expected.

I was looking for an issue for this in the tracker but there are hundreds of results with all of the searches I have tried. Does anyone know if there is a bug report for this?