Dear Paul, 

If this thread addresses your question:

https://lists.gnu.org/archive/html/lilypond-user/2025-02/msg00189.html

I think you are basing your MWE off of this, am I right?

https://lilypond.org/doc/v2.25/Documentation/snippets/expressive-marks-_002d-contemporary-glissando

In the referenced message thread you will find that there are people (myself 
included) who pointed out that it should be updated with the one using \after 
function.

Yoshi

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