Ah after a bit more playing around I’ve realised it’s nothing to do with the barline, this happens with any percussion note that gets tied to a following note
I think it’s something to do with rhythm truncation (as I’m writing I see Jesper has spotted this too!).
So if I want to do something like this (which I’ve seen in a lot of charts):
but using just one stem direction for everything I can’t actually do that without switching off the rhythm truncation. I tried Derrek’s suggestion and it gave me this:
If I switch off truncation on the score on which I’m currently working it creates an absolute disaster…but if I’d kept this in mind from the start then I guess this would have been the solution?!
Anyway it just feels a little counter intuitive for notes to disappear (even if they’re just following the truncation rules) in a scenario like this. For short percussion notes then yes their duration technically doesn’t matter (well it might actually for a percussionist but I won’t bore you with the reasons why) but with a cymbal note, for example, then seeing the full note duration does sometimes matter.