Might be the same thing as here:
http://lilypond.1069038.n5.nabble.com/Curious-thing-about-ties-td196616.html
> On 26 Jul 2018, at 12:37, Thomas Morley <thomasmorle...@gmail.com> wrote:
>
> Hi,
>
> please consider the following example:
>
> \version "2.19.82"
>
> \relative c'' {
> f,1
> r4 b~ b8 a b4~
> b8 a b2.
> \repeat unfold 8 f8
> }
>
> The ties have different directions.
> If you change the example a little bit you may (or may not) get equal
> directions.
>
> Where does it comes from?
> Or wit different wording, what are the conditions for the tie's
> direction applying here?
>
> Thanks,
> Harm
>
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