Glissando over a Tie note plays the 2nd last note twice.
Play the file I uploaded.
On the second Glissando (Black Keys only), you can clearly hear the 2nd last note being played loudly.
This isn't the first time I've encountered this bug. I did make a post 2 months ago but there weren't any solutions and I wasn't sure what caused it.
There are situations where I really have to use Ties on Glissandos because it wouldn't make much sense for the time value of notes.
The image that I attached on this post is an example.
A whole time value of 2/1/2 note doesn't exist. And on MuseScore, I'm sure it's pretty much the same on other software as well, the missing quaver note/rest would not be played. But instead, the Glissando will be performed up until the last 2nd note, stops playing over the rest/missing Tie note, then the last note.