Acciaccatura question/issue

[jh]

using 2.22.2 in fresco, my very old understanding of grace and 
acciaccatura is that they receive no duration value in a measure.  the 
following Minimal example using forget for accidentals when compiled 
allows only 3 quarter notes in a 4/4 bar.  I changed the 8ths in the 
acciaccatura to 16ths in case that was the problem but that's not the 
solution.
~
<ges' ces es>4^\markup {IX}<f bes d><es aes ces><d aes bes><es f bes>
       \acciaccatura {\times 2/3 {aes16 ges aes}} <d, f bes>4
       \acciaccatura {\times 2/3 {aes'16 ges f}} <ces es ges>4
       \acciaccatura {\times 2/3 {ges'16 f d}} <es ges bes>4\fermata\bar 
"||"
       d'8 f es16 ces bes8 aes ces bes16 ges f8 es4 ~ <es,, es''>\bar 
"||"

So what don't I understand?

--
Thank you Sound & Silence

Beginning May 1, 2021 a new address; 1814 Lake Washington Blvd. So.,
Seattle, Wa. 98144

_206-328-7694 or messages at 206-308-8189_

www.soundand.com

and an online short (45 minute) concert of new material on Wayward in 
Limbo


https://www.waywardmusic.org/?p=6082