Shared noteheads aren't shared
I have to use two voices sometimes when two parts have a unison pitch and duration (examples included). The notehead should be shared with two stems, one up and one down. When I change the notehead from round to a shape (I use the Aiken seven shape system) the noteheads are no longer shared. If I use the Shape Note plug-in to convert all notes to round noteheads, then use it to convert them all back to Aiken shapes, the noteheads are shared properly. However, any editing, including clicking on a note or pressing Ctrl+A, causes the noteheads to separate again. In these examples, Show Invisible is selected. The first example shows what I have accomplished. Notice the pick-up type measures that begin each system. Note also that all the noteheads are shaped properly, but those that should be shared aren't.
The second example shows the result after I use the Shape Note plug-in to convert to normal round notes. To my surprise, the noteheads still aren't shared properly and not all the noteheads were converted! I have had to manually convert some round noteheads to their proper shape. I believe they were all in the lower staff.
The third example shows the wonderful results I get when I use the Shape Note plug-in to convert the noteheads back to the seven shape format. It looks wonderful! Even the noteheads are shared properly!
The fourth example shows that my joy is short lived after clicking on a note without making any other changes. The noteheads are no longer shared.
Even though I can get the results I need, it is frustrating as I try to correct formatting problems to repeatedly use the Shape Note plug-in to convert the notes back to round notes and then use it again to convert them back to shape notes every time I correct something in order to see if the formatting is correct. I hope someone can correct this problem.